Ætla
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TLA + is a formal specification language developed by Leslie Lamport. It is used for designing, modelling, documentation, and verification of programs, especially concurrent systems and distributed systems. TLA + is considered to be exhaustively-testable pseudocode, and its use likened to drawing blueprints for software systems; TLA is an acronym for Temporal Logic of Actions. For design and documentation, TLA + fulfills the same purpose as informal technical specifications. However, TLA + specifications are written in a formal language of logic and mathematics, and the precision of specifications written in this language is intended to uncover design flaws before system implementation is underway. Since TLA + specifications are written in a formal language, they are amenable to finite model checking. The model checker finds all possible system behaviours up to some number of execution steps, and examines them for violations of desired invariance properties such as safety and liveness. TLA + specifications use basic set theory to define safety (bad things won't happen) and temporal logic to define liveness (good things eventually happen). TLA + is also used to write machine-checked proofs of correctness both for algorithms and mathematical theorems. The proofs are written in a declarative, hierarchical style independent of any single theorem prover backend.…
Ætla, who lived in the 7th century, is believed to be one of many Bishops of Dorchester during the Anglo-Saxon period. The village of Attlebridge, Norfolk is named after him, as he is credited for the construction of a bridge ('brycg' in Old English) there. Ætla was attested about 660. In the 670s, the seat of his bishopric was at Dorchester-on-Thames, which was then under Mercian control. He does not seem to have had any comparable predecessors or successors in that see.
Early life
Details regarding Ætla's early life are sparse. The venerable historian Bede's writings indicate a comparatively short duration of his existence. Prior to assuming the mantle of bishop, Ætla pursued a monastic vocation within the Northumbrian Monastery of Whitby.
Citations
References
Powicke, F. Maurice and E. B. Fryde Handbook of British Chronology 2nd. ed. London:Royal Historical Society 1961
External links
Text derived from https://en.wikipedia.org/w/index.php?oldid=1377242510 under CC BY-SA 4.0; modifications have been made.