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American computer hardware company
Sequent Computer Systems, Inc. was a computer company that designed and manufactured multiprocessing computer systems. They were among the pioneers in
Sequent_Computer_Systems
Operating system
DYNIX (DYNamic UnIX) was a Unix-like operating system developed by Sequent Computer Systems, based on 4.2BSD and modified to run on Intel-based symmetric
DYNIX
Such systems may constitute personal computers (including desktop computers, portable computers, laptops, all-in-ones, and more), mainframe computers, minicomputers
List of computer system manufacturers
List_of_computer_system_manufacturers
Computer memory design used in multiprocessing
Bull), Silicon Graphics (later Silicon Graphics International), Sequent Computer Systems (later IBM), Data General (later EMC, now Dell Technologies), Digital
Non-uniform_memory_access
Style of formal logical argumentation
logic, sequent calculus is a style of formal logical argumentation in which every line of a proof is a conditional tautology (called a sequent by Gerhard
Sequent_calculus
Early commercial UNIX operating system
platforms, as a joint project of Compaq, IBM, Intel, SCO, and Sequent Computer Systems. The target platform was meant to be Intel's new IA-64 architecture
UNIX_System_V
Topics referred to by the same term
may also refer to: Sequent (MUD), text-based online game software Sequent Computer Systems, a defunct computer hardware company Sequent calculus Sequence
Sequent_(disambiguation)
parallel computing systems. Together with Pyramid Technology and Sequent Computer Systems, Alliant's machines pioneered the symmetric multiprocessing market
Alliant_Computer_Systems
a few of the "Alice" participants left the company and went to Sequent Computer Systems. The 3B5, 3B15, 3B20S and 3B20D line, begun in 1982, was aimed
AT&T_Computer_Systems
Logical proof involving antecedents and consequents
In mathematical logic, a sequent is a very general kind of conditional assertion. A 1 , … , A m ⊢ B 1 , … , B n . {\displaystyle A_{1},\,\dots ,A_{m}\
Sequent
company, SuperComputer International (SCI), later that year. SCI was renamed Chen Systems in 1995. It was acquired by Sequent Computer Systems the following
Steve Chen (computer engineer)
Steve_Chen_(computer_engineer)
American television personality
Fortune 500 companies. A friend encouraged him to take a job with Sequent Computer Systems, which was headquartered in Beaverton, Oregon, in order to escape
Matt_Roloff
Equal sharing of all resources by multiple identical processors
system, the VAX-11/782, was asymmetric, but later VAX multiprocessor systems were SMP. Early commercial Unix SMP implementations included the Sequent
Symmetric_multiprocessing
American software engineer (born 1978)
2000. While in Oregon, he worked as an operating system developer, enhancing Sequent Computer Systems's DYNIX/ptx. In late 2000, Lattner joined the University
Chris_Lattner
Businessman
held senior engineering and marketing management positions at Sequent Computer Systems (now part of IBM), Bipolar Integrated Technology and Lattice Semiconductor
Abhi_Talwalkar
British electronic company
Apricot bought the rights to assemble the Sequent Computer Systems multi-processor 80386 Symmetry Unix system in the UK. In 1989, a cover story in Byte
Apricot_Computers
County in Oregon, United States
headquarters in Washington County. Until it was acquired by IBM, Sequent Computer Systems was headquartered near Nike. Other companies with headquarters
Washington_County,_Oregon
Microsoft Unix operating system
offered their own iRMX operating system as an alternative for these. Unrelated to the later Dynix from Sequent Computer Systems Letwin, Gordon (1995-08-17)
Xenix
Product's capability divided by its cost
including DEC, Data General and many multiprocessor vendors such as Sequent Computer Systems and Pyramid Technology. Benefit–cost ratio Kurzweil, Raymond (2005)
Price–performance_ratio
American software company (1985–2002)
multiprocessor with Unisys, Intel, and Sequent Computer Systems. Microport was among the first to compile System V, Release 4 (SVR4) for the Pentium processor
Microport_Systems
System of formal deduction in logic
variants of Hilbert systems is that the context is not changed in any of their rules of inference, while both natural deduction and sequent calculus contain
Hilbert_system
Method of deriving conclusions
Influential frameworks include natural deduction systems, Hilbert systems, and sequent calculi. Natural deduction systems aim to reflect how people naturally reason
Rule_of_inference
Relationship between programs and proofs
Structure Isomorphic to Gentzen-Style Sequent Calculus Structure", in Pacholski, Leszek; Tiuryn, Jerzy (eds.), Computer Science Logic, 8th International Workshop
Curry–Howard_correspondence
American computer software company
database software for computers using the Unix, Microsoft Windows, and Apple Macintosh operating systems. 1980: Relational Database Systems Inc. was created
Informix_Corporation
American businessman (born 1966)
and its properties in a trade from Casey Powell, former CEO of Sequent Computer Systems in 1995, then spent $8.7 million constructing a new wing to the
Andrew_Wiederhorn
Software company based in Santa Cruz, California
operating system that SCO made is for the PDP-11, is named DYNIX (not to be confused with a same-named Unix variant later made by Sequent Computer Systems), and
Santa_Cruz_Operation
Nickname for the cluster of high-tech companies near Portland, USA
2001; Washington County campus closed in 2014) Sequent Computer Systems (purchased by IBM in 1993) Sequent, founded by a team that included three Intel
Silicon_Forest
motherboards sourced from Intel. Sequent Computer Systems, now part of IBM, was following a similar strategy at the time. A system codenamed "Manx" was an earlier
Aviion
This is a list of operating systems. Computer operating systems can be categorized by technology, ownership, licensing, working state, usage, and by many
List_of_operating_systems
High-speed interconnect standard for shared memory multiprocessing and message passing
access architectures. It was also used by Sequent Computer Systems as the processor memory bus in their NUMA-Q systems. Numascale developed a derivative to
Scalable_Coherent_Interface
Technologies (USA), A subsidiary of Dascom Holdings. Mylex Corporation. Sequent Computer Systems for $810 million. Number of acquisitions per year according to
List of mergers and acquisitions by IBM
List_of_mergers_and_acquisitions_by_IBM
Operating system with support for multilevel security
HP/UX, SCO) Sequent Computer Systems (Dynix/ptx) Silicon Graphics (IRIX) Sun Microsystems (SunOS, Solaris) Trusted Information Systems (Xenix, Mach)
Trusted_operating_system
Former multi-processor computer company
UBE's own computer division into the mix. They had long been working with Sequent Computer Systems, and were sceptical that the BiiN systems would deliver
BiiN
System of resource-aware logic
initial sequents and the cut-elimination theorem, inducing a notion of analytic proof) lies behind the applications of linear logic in computer science
Linear_logic
A sequent calculus is said to have the focusing property when focused proofs are complete for some terminating condition. For System LK, System LJ,
Focused_proof
Minicomputer manufacturer, 1968–1999
Intel x86 series. By this time a number of other vendors, notably Sequent Computer Systems, were also introducing similar machines. The lack of lock-in now
Data_General
Less-restrictive form of modal logic
rule in its Hilbert calculus or the E rule in its sequent calculus upon the corresponding proof systems for classical propositional logic. Additional axioms
Non-normal_modal_logic
Synchronization mechanism
U.S. patent 5,442,758, issued August 15, 1995, and assigned to Sequent Computer Systems, as well as by U.S. patent 5,608,893 (expired 2009-03-30), U.S
Read-copy-update
Artificial intelligence safety researcher
scientist. In 2026, Irving became a co-founder and chief scientist of Sequent Research, an artificial intelligence alignment research organization. Irving's
Geoffrey_Irving
Algebraic manipulation of "true" and "false"
between sequent calculus and propositional calculus. Boolean algebra as the calculus of two values is fundamental to computer circuits, computer programming
Boolean_algebra
Branch of mathematical logic
Sonia; Straßburger, Lutz (2016), Focused and Synthetic Nested Sequents, Lecture Notes in Computer Science, vol. 9634, Berlin, Heidelberg: Springer Berlin Heidelberg
Proof_theory
Rule of mathematical logic
is an inference rule of a sequent calculus that does not refer to any logical connective but instead operates on the sequents directly. Structural rules
Structural_rule
Cirquent calculus (circuit sequent calculus) is a proof calculus that combines aspects of sequent calculus and boolean circuits. Its proof-objects are
Cirquent_calculus
Massachusetts computer pioneer
Alliant, and the most similar systems Sequent and FLEX. Encore was founded in 1983 by: Kenneth Fisher, former CEO of Prime Computer; Gordon Bell, an engineering
Encore_Computer
U.S. federal court case about Linux use
strategy, This technique is widely believed to have been developed at Sequent Computer Systems, who were then bought by IBM, who holds several patents (including
SCO Group, Inc. v. International Business Machines Corp.
SCO_Group,_Inc._v._International_Business_Machines_Corp.
Short-lived class of computers
Siemens in 1995) Scientific Computer Systems (founded 1983; switched to high-speed network development in 1989; now defunct) Sequent (Acquired by IBM in 1999)
Minisupercomputer
Topics referred to by the same term
Molecular symmetry in chemistry Symmetry, a line of SMP computers by Sequent Computer Systems Symmetry (band), American instrumental duo Symmetry (film)
Symmetry_(disambiguation)
Computer manufacturing company in the US
Silicon Valley, US, along with a host of competitors (Trilogy Systems, Sequent, Convex Computer). The Elxsi processor was an Emitter Coupled Logic (ECL) design
Elxsi
Kind of proof calculus
natural deduction. For this reason he introduced his alternative system, the sequent calculus, for which he proved the Hauptsatz both for classical and
Natural_deduction
American telecom technology company
leased from Sequent Computer Systems, by 1994 the company had grown to annual sales of $20 million. The company's products were computers used in end
Radisys
Propositional proof system
all Frege systems are p-equivalent. Natural deduction and sequent calculus (Gentzen system with cut) are also p-equivalent to Frege systems. There are
Frege_system
Branch of logic
via natural deduction. The sequent calculus is a formal system that represents logical deductions as sequences or "sequents" of formulas. Developed by
Propositional_logic
Control Systems and is active as an Angel investor. He has previously served on the boards of Index Systems Inc; Emhart Corporation; ICL Plc; Sequent Computer
Michael_Scott_Morton
British mathematician and logician
Eulogy". St Andrews Computer Science Blog. 13 November 2018. Retrieved 1 June 2025. Dyckhoff, Roy (1992). "Contraction-free sequent calculi for intuitionistic
Roy_Dyckhoff
PC-compatible computer made by Apricot
badge-engineered versions of Sequent Computer Systems's Symmetry line of large symmetric multiprocessing (SMP) computer systems. These were intended for heavy-duty
Apricot_VX_FT
Sequent's Dynix, NeXT's NeXTSTEP, DEC's Ultrix and OSF/1 AXP (which became the now discontinued Tru64 UNIX). FreeBSD aims to make an operating system
Comparison of BSD operating systems
Comparison_of_BSD_operating_systems
Hardware architecture for big data applications
technology" for Teradata Additional vendors, including Tandem Computers, and Sequent Computer Systems also offered MPP architectures in the 1980s. Open source
Data_warehouse_appliance
Formal verification tool
\rangle } . At the heart of the KeY system lies a first-order theorem prover based on a sequent calculus. A sequent is of the form Γ ⊢ Δ {\displaystyle
KeY
American businessman (born 1951)
in computer science from the University of Glasgow, Scotland. Before joining F5, McAdam was president and chief operating officer of Sequent Computer Systems
John_McAdam_(businessman)
Mathematical proof at least partially generated by computer
A computer-assisted proof is a mathematical proof that has been at least partially generated by computer. Most computer-aided proofs to date have been
Computer-assisted_proof
Symbol representing a property or relation in logic
proof Natural deduction Logical consequence Rule of inference Sequent calculus Theorem Systems axiomatic deductive Hilbert list Complete theory Independence
Predicate_(logic)
Statement in a metalanguage
Hilbert-style deduction systems is that the context is not changed in any of their rules of inference, while both natural deduction and sequent calculus contain
Judgment_(mathematical_logic)
Proof assistant program
specialized modes of display for proofs. Jape works with variants of the sequent calculus and natural deduction. It also supports formal proofs with quantifiers
Jape_(software)
Struggles between vendors to set Unix standard
Computer Systems Research Group was the leading non-commercial Unix developer. In the mid-1980s, the three common versions of Unix were AT&T's System
Unix_wars
Establishment of a theorem using inference from the axioms
sentence or determine that none exists. The concepts of Fitch-style proof, sequent calculus and natural deduction are generalizations of the concept of proof
Formal_proof
1990s Unix coalition
Operation (SCO) provided IA-32 support, and Sequent added multi-processing (MP) support from their DYNIX/ptx system. Intel Corporation provided expertise and
Project_Monterey
Mathematical term; concerning axioms used to derive theorems
logic, an axiomatic system or axiom system is a standard type of deductive logical structure, used also in theoretical computer science. It consists
Axiomatic_system
Logical connective AND
conjunction works exactly like normal arithmetic multiplication. In high-level computer programming and digital electronics, logical conjunction is commonly represented
Logical_conjunction
Extension of linear logic
difficulty of designing sequent systems for pomset logic that have cut-elimination. Lutz Straßburger devised a related system, NEL, also in the calculus
Noncommutative_logic
Mathematical model for deduction or proof systems
to use formal systems as the foundation of knowledge in mathematics. However, in 1931 Kurt Gödel proved that any consistent formal system sufficiently
Formal_system
Branch of logic
resource composition, which aid in the compositional analysis of computer and other systems. It has category-theoretic and truth-functional semantics, which
Bunched_logic
American computer scientist and author
Logic to Reason about Sequent Systems". Automated Reasoning with Analytic Tableaux and Related Methods. Lecture Notes in Computer Science. Vol. 2381. pp
Dale_Miller_(academic)
as various kinds of networks as opposed to the flat tree structures of sequent calculus. To distinguish the real proof nets from all the possible networks
Geometry_of_interaction
and organisations, including those of the University of Oslo, Sequent Computer Systems, IBM UK and Tiscali. He has held a number of professional affiliations
Georgios_Magklaras
computer systems. LINC was originally developed as a short-cut (or template) by two programmers to reproduce and automate the production of computer applications
LINC_4GL
Argument that leads to a logical absurdity
then P {\displaystyle P} may be concluded." In sequent calculus the principle is expressed by the sequent Γ , ¬ ¬ P ⊢ P , Δ {\displaystyle \Gamma ,\lnot
Reductio_ad_absurdum
Problem in computer science
theory, the halting problem is the decision problem of, given an arbitrary computer program and an input, determining whether said program will eventually
Halting_problem
Unix operating system
Berkeley Unix, is a discontinued Unix operating system developed and distributed by the Computer Systems Research Group (CSRG) at the University of California
Berkeley Software Distribution
Berkeley_Software_Distribution
American businessman and entrepreneur (born 1941)
clients such as Cullinet, Computer Associates, Revelation Technologies, Hewlett Packard, Sybase, AT&T/NCR, DEC, Sequent Computer Systems, Borland and IBM. In
George_Schussel
Subfield of automated reasoning and mathematical logic
ATP System Competition (CASC), a yearly competition of first-order systems for many important classes of first-order problems. Some important systems (all
Automated_theorem_proving
1991 video game
Sequent was a DikuMUD derivative codebase developed by Raja Kushalnagar ("Duke of Sequent"). It was a text-based online role-playing game that was an
Sequent_(MUD)
Computation model defining an abstract machine
rules. Despite the model's simplicity, it is capable of implementing any computer algorithm. The machine operates on an infinite memory tape divided into
Turing_machine
Field in logic and theoretical computer science
accepts. Examples of propositional proof systems include sequent calculus, resolution, cutting planes and Frege systems. Strong mathematical theories such as
Proof_complexity
Computer processor contained on an integrated-circuit chip
by large companies like Canon. By the mid-1980s, Sequent introduced the first SMP server-class computer using the NS 32032. This was one of the design's
Microprocessor
obligated to recognize Novell's waiver of SCO's claims against IBM and Sequent". After the ruling, Novell announced they have no interest in suing people
History_of_Unix
Symbol in mathematical logic
implies ⊢ {\displaystyle \vdash } ) In sequent calculus, the turnstile is used to denote a sequent. A sequent A 1 , … , A m ⊢ B 1 , … , B n {\displaystyle
Turnstile_(symbol)
— Intel IA-64 processors Montera — Intel processors Monterey — SCO/IBM/Sequent Unix Montvale — Intel successor to Montecito processors due 2007 Monza
List of computer technology code names
List_of_computer_technology_code_names
undefinability theorem Diagonal lemma Provability logic Interpretability logic Sequent Sequent calculus Analytic proof Structural proof theory Self-verifying theories
List of mathematical logic topics
List_of_mathematical_logic_topics
(D\mid B))\mid ((C\mid B)\mid A)]} Computer analysis by Argonne has revealed over 60 additional single axiom systems that can be used to formulate NAND
List of axiomatic systems in logic
List_of_axiomatic_systems_in_logic
Sequence of words formed by specific rules
In logic, mathematics, computer science, and linguistics, a formal language is a set of strings whose symbols are taken from a set called "alphabet". The
Formal_language
ISBN 9780444508133. Degtyarev, Anatoli; Voronkov, Andrei (2001). "Equality Reasoning in Sequent-Based Calculi". In Robinson, John Alan; Voronkov, Andrei (eds.). Handbook
Andrei Voronkov (computer scientist)
Andrei_Voronkov_(computer_scientist)
Various systems of symbolic logic
generally called constructive logic, refers to systems of symbolic logic that differ from the systems used for classical logic by more closely mirroring
Intuitionistic_logic
Subfield of mathematics
Several deduction systems are commonly considered, including Hilbert-style deduction systems, systems of natural deduction, and the sequent calculus developed
Mathematical_logic
Type of logical system
sequent calculus was developed to study the properties of natural deduction systems. Instead of working with one formula at a time, it uses sequents,
First-order_logic
Limitative results in mathematical logic
enumerable. This means that there is a computer program that, in principle, could enumerate all the theorems of the system without listing any statements that
Gödel's incompleteness theorems
Gödel's_incompleteness_theorems
Type of formal logic
duality between the two systems is best seen within a sequent calculus framework. While in intuitionistic logic the sequent ⊢ A ∨ ¬ A {\displaystyle
Paraconsistent_logic
Rule of logical inference
argument using modus ponens is said to be deductive. In single-conclusion sequent calculi, modus ponens is the Cut rule. The cut-elimination theorem for
Modus_ponens
Digital circuit without clock cycles
standing for "switching x on the background y" or "if x when y then") and sequention (with priority signs "xi≻xj" and "xi≺xj"). This takes into account not
Asynchronous_circuit
How a type system assigns a type to a syntactic construction
(mathematical logic) Type system Type theory Curry–Howard correspondence Sequent calculus Pierce, Benjamin C. (2002). Types and Programming Languages (1st ed
Typing_rule
Operating system microkernel
ranging from shared memory systems to systems with no memory shared between processors. Mach is designed to run on computer systems ranging from one to thousands
Mach_(kernel)
SEQUENT COMPUTER-SYSTEMS
SEQUENT COMPUTER-SYSTEMS
Boy/Male
Tamil
Computer
Boy/Male
Hindu
Computer
Surname or Lastname
English (also frequent in Wales)
English (also frequent in Wales) : patronymic from the personal name Watkin.
Boy/Male
Tamil
Request
Girl/Female
Hindu, Indian
Request
Girl/Female
Muslim
To compete with pride
Boy/Male
American, Australian, British, English, French, Latin
Fifth; Surname; Variant of Quentin Fifth
Girl/Female
Arabic, Muslim
To Compete with Pride
Boy/Male
Biblical
Serpent.
Boy/Male
Hindu
Request
Girl/Female
Tamil
Anuloma | அநà¯à®²à¯‹à®®à®¾
Sequence
Anuloma | அநà¯à®²à¯‹à®®à®¾
Boy/Male
Indian, Sanskrit
Unattained; Cannot be Competed with
Girl/Female
French, German, Teutonic
Serpent
Surname or Lastname
English and French
English and French : variant of Sargent.Americanized form of the Polish Jewish ornamental name Sieṛzant ‘sergeant’ (senior noncommissioned officer in the Polish infantry).
Boy/Male
African
request'.
Boy/Male
Arabic, Muslim
Compiler of Hadith
Boy/Male
English French
fifth.' Surname.
Boy/Male
Hindu, Indian, Sanskrit
Compiler of the Vedas
Boy/Male
Muslim
Compiler of Hadith
Girl/Female
Teutonic
Serpent.
SEQUENT COMPUTER-SYSTEMS
SEQUENT COMPUTER-SYSTEMS
Boy/Male
Hindu, Indian, Kannada, Malayalam, Marathi, Telugu
A Shell
Boy/Male
Gujarati, Hindu, Indian
Brave
Boy/Male
Tamil
Perarasi | பேராரஸீ
Empress
Girl/Female
German, Latin
Archaic; Ancient; Old; Primitive
Boy/Male
Tamil
Diptanu | தீபà¯à®¤à®¾à®¨à¯à®‚
Shiner
Boy/Male
Arabic, Muslim
Another Name for the Quran; Speech; Conversation
Male
Hebrew
(זַבְדִּי) Hebrew name ZABDIY means "the gift of Jehovah. In the bible, this is the name of several characters, including a son of Zerah.
Girl/Female
Muslim
Wish, Desire, Intention
Boy/Male
Hindu
Girl/Female
Tamil
Name of a river
SEQUENT COMPUTER-SYSTEMS
SEQUENT COMPUTER-SYSTEMS
SEQUENT COMPUTER-SYSTEMS
SEQUENT COMPUTER-SYSTEMS
SEQUENT COMPUTER-SYSTEMS
v. t.
To exchange; to put or substitute something else in place of, as a smaller penalty, obligation, or payment, for a greater, or a single thing for an aggregate; hence, to lessen; to diminish; as, to commute a sentence of death to one of imprisonment for life; to commute tithes; to commute charges for fares.
n.
That which follows or succeeds as an effect; sequel; consequence; result.
v. t.
To address with a request; to ask.
n.
One who commutes; especially, one who commutes in traveling.
imp. & p. p.
of Commute
n.
A composer or compiler of hymns; one versed in hymnology.
imp. & p. p.
of Compute
v. i.
To wind like a serpent; to crook about; to meander.
a.
Looking obliquely, or asquint; malignant; as, squint-eyed praise; squint-eyed jealousy.
v. i.
To pay, or arrange to pay, in gross instead of part by part; as, to commute for a year's travel over a route.
n.
A computer.
n.
The state of being sequent; succession; order of following; arrangement.
n.
Often to be met with; happening at short intervals; often repeated or occurring; as, frequent visits.
p. pr. & vb. n.
of Compute
n.
That which follows as a result; a sequence.
n.
A segment gear.
n.
One of the parts into which any body naturally separates or is divided; a part divided or cut off; a section; a portion; as, a segment of an orange; a segment of a compound or divided leaf.
n.
A preparation of fruit in sirup in such a manner as to preserve its form, either whole, halved, or quartered; as, a compote of pears.
n.
One who computes.
imp. & p. p.
of Compete