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Definition of weak-head-reduction and proof of unicity of derivations #543

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Weak-head reduction is defined just like red1 without the congruence rules. To show a standardization theorem on it we'll need to show that it commutes with "internal" reduction that just does the missing congruences.

jakobbotsch and others added 30 commits December 13, 2020 13:50
…y if we don't have direct access to the indices of the inductive and the arguments of constructors (due to "instantiate_params" and destArity getting in the way).
…uctives in the environment. Direct access to the contexts of indices and sort of an indutive, and constructor arguments and conclusion indices.
…mmas for spines involving identity substitutions
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