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* Sequent calculus: better discuss structural rules.David A. Madore2023-12-111-0/+38
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* Make the fix less confusing.David A. Madore2023-12-111-6/+3
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* Fix a mistake: contraction rule cannot be dispensed with.David A. Madore2023-12-091-10/+7
| | | | | | (See discussion in example 3.1.3 in Troelstra & Schwichtenberg: the system I presented is essentially their G2i, and the contraction rule is necessary.)
* Fix various mistakes noted during lecture on 2023-12-08.David A. Madore2023-12-081-9/+12
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* Thinko.David A. Madore2023-12-051-1/+1
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* Various minor changes (upon re-reading).David A. Madore2023-12-051-17/+28
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* Examples of sequent calculus proofs.David A. Madore2023-12-041-3/+74
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* The rules of sequent calculus.David A. Madore2023-12-041-0/+84
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* Functoriality of connectors and of logical formulae.David A. Madore2023-12-041-24/+123
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* Positive and negative occurrences.David A. Madore2023-12-041-0/+43
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* A start of polymorphism, and substitution for type/prop variables.David A. Madore2023-12-041-2/+35
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* Comments on negation and double negation.David A. Madore2023-12-041-0/+40
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* Curry-Howard: a recapitulation.David A. Madore2023-12-041-4/+47
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* Various minor changes or additions.David A. Madore2023-12-041-1/+21
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* More discussion of the logical connectors.David A. Madore2023-12-041-4/+53
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* Non-uniqueness of proofs.David A. Madore2023-12-031-1/+57
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* Various examples of Curry-Howard.David A. Madore2023-12-031-1/+81
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* Curry-Howard correspondence for true and false.David A. Madore2023-12-031-1/+32
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* An example of Curry-Howard with disjunction.David A. Madore2023-12-031-0/+41
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* Remarks on products and sums.David A. Madore2023-12-031-2/+44
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* Curry-Howard correspondence for disjunction.David A. Madore2023-12-031-0/+31
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* An example of Curry-Howard with implication.David A. Madore2023-12-031-0/+31
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* An example of Curry-Howard with conjunction.David A. Madore2023-12-031-4/+74
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* Curry-Howard correspondence for implication alone.David A. Madore2023-12-031-0/+44
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* Brouwer-Heyting-Kolmogorov interpretation of logical connectives.David A. Madore2023-12-031-1/+28
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* A few more important tautologies.David A. Madore2023-12-031-1/+5
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* Various informal explanations of constructive math / intuitionism.David A. Madore2023-12-021-0/+142
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* Classical logic.David A. Madore2023-12-021-3/+71
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* Proof of negation vs reduction ad absurdum.David A. Madore2023-12-021-0/+54
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* Examples of non-tautologies.David A. Madore2023-12-021-3/+37
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* Some important tautologies.David A. Madore2023-12-021-0/+58
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* Yet another presentation of natural deduction proofs (flag presentation).David A. Madore2023-12-021-2/+38
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* Another presentation of natural deduction proofs.David A. Madore2023-12-021-2/+49
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* An exercise on a possible representation of pairs in functional programming ↵David A. Madore2023-12-011-5/+146
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* Another exercise on various "loopy" reductions.David A. Madore2023-12-011-1/+120
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* Give two examples of natural deduction proofs (written in sequent style).David A. Madore2023-11-301-0/+41
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* Some exercises on the untyped lambda-calculus.David A. Madore2023-11-301-0/+286
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* Minor fixes.David A. Madore2023-11-301-3/+3
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* Much longer explanation of the Y (and also Z) combinator.David A. Madore2023-11-281-5/+139
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* Highlight discharged hypotheses in natural deduction presentation.David A. Madore2023-11-281-3/+7
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* Fix various small mistakes or unclear points.David A. Madore2023-11-281-9/+8
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* Alternative notation for multiple lambdas.David A. Madore2023-11-281-2/+3
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* Avoid speaking of type "constructors", a word which might cause confusion.David A. Madore2023-11-281-4/+4
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* Typo.David A. Madore2023-11-281-1/+1
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* Rules of inuitionistic propositional calculus in natural deduction style.David A. Madore2023-11-271-0/+39
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* Syntax of propositional calculus.David A. Madore2023-11-271-2/+39
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* Quick overview of intuitionistic propositional calculus.David A. Madore2023-11-271-0/+38
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* A (humorous) graphical representation of the Curry-Howard correspondence.David A. Madore2023-11-243-4/+27
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* Graphical representation of typing rules.David A. Madore2023-11-221-8/+35
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* Brief summary of Tait's proof of normalization of the STLC.David A. Madore2023-11-221-5/+42
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