An Instruction Sequence Semigroup with Involutive Anti-Automorphisms

Details An Instruction Sequence Semigroup with Involutive Anti-Automorphisms An Instruction Sequence Semigroup with Involutive Anti-Automorphisms

2009-03-07

arxiv.org/abs/0903.1352v2

Scientific Annals of Computer Science, 19:57-92, 2009

Computer Science

Programming Languages

36 pages, 1 table

Scientific paper

We introduce an algebra of instruction sequences by presenting a semigroup C in which programs can be represented without directional bias: in terms of the next instruction to be executed, C has both forward and backward instructions and a C-expression can be interpreted starting from any instruction. We provide equations for thread extraction, i.e., C's program semantics. Then we consider thread extraction compatible (anti-)homomorphisms and (anti-)automorphisms. Finally we discuss some expressiveness results.

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