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3 votes
0 answers
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When does weak normalization imply strong normalization?

Is there a possibility to get strong normalization for some kind of $\lambda$-calculus out of weak normalization with some other assumptions? For example: The term $(\lambda_y z)((\lambda_x xx)(\...
Zermelo-Fraenkel's user avatar
7 votes
1 answer
375 views

Criterion for the consistency of pure type systems

Pure type systems are characterized in an almost combinatorial way: a set of axioms $\star_i : \star_j$, and a set of triples $(\star_i, \star_j, \star_k)$ saying when the dependent product $\prod_{x :...
Trebor's user avatar
  • 1,262
11 votes
3 answers
1k views

How to handle sums in Tait's reducibility proof of strong normalisation?

I've been reading Girard et al's 'Proofs and Types', which in Chapter 6 presents a proof of strong normalisation for the simply typed lambda calculus with products and base types. The proof is based ...
RAC's user avatar
  • 113
3 votes
0 answers
283 views

Understanding Strong Normalization for Identity Types in Martin-Löf Intensional Type Theory [closed]

Roughly, the strong normalization property for Martin-Löf Intensional Type Theory (MITT) tells us that every closed term $t$ of type $M$ will eventually reach a canonical normal form $t’$ such that it ...
StudentType's user avatar