“Propositions as Types“ by Philip Wadler 听不懂的学习笔记

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  • David Hilbert

put maths to alogo

provable statement

  • Kurt

statement it nt provble

you prove sth is false

it 's true but no provable

formal definiton

  • Alonzo Church

lambda calculus

halting proble


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  • Kurt

second definition

the same as you

  • Alan Turing

Turing Machine

als equal

computer = turing machine

all three same


mathematic invented or discovered?

you discover!

Part II Propositions as types

  • Gerhard Gentzen

Natural Deducion

implication

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elimination rules

A proof

know A and B, i can know B and A

a formal proof

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simplifying proofs

sub formular

formulars ->

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proof can be simpled

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听不懂,放弃了