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Stream Differential Equations: Specification Formats and Solution Methods

Helle Hvid Hansen ; Clemens Kupke ; Jan Rutten.

Streams, or infinite sequences, are infinite objects of a very simple type, yet they have a rich theory partly due to their ubiquity in mathematics and computer science. Stream differential equations are a coinductive method for specifying streams and stream operations, and their theory has been&nbsp;[&hellip;]

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Coinductive Foundations of Infinitary Rewriting and Infinitary Equational Logic

Jörg Endrullis ; Helle Hvid Hansen ; Dimitri Hendriks ; Andrew Polonsky ; Alexandra Silva.

We present a coinductive framework for defining and reasoning about the infinitary analogues of equational logic and term rewriting in a uniform, coinductive way. The setup captures rewrite sequences of arbitrary ordinal length, but it has neither the need for ordinals nor for metric convergence.&nbsp;[&hellip;]

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