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identity_type [2016/04/12 15:40] nikolaj |
identity_type [2016/04/12 15:42] nikolaj |
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==== Intension, extension ==== | ==== Intension, extension ==== | ||
+ | See [[http://mathoverflow.net/questions/156238/function-extensionality-does-it-make-a-difference-why-would-one-keep-it-out-of | ||
+ | | Andrej Bauer on intentional equality]] | ||
+ | |||
=== The concept === | === The concept === | ||
There is a correspondence between a predicate $P$ over a class of objects and it's //extension// $\{x\ |\ P(x)\}$. The latter is the collection of objects it describes. | There is a correspondence between a predicate $P$ over a class of objects and it's //extension// $\{x\ |\ P(x)\}$. The latter is the collection of objects it describes. | ||
Line 101: | Line 104: | ||
=== Reference === | === Reference === | ||
- | nLab: [[http://ncatlab.org/nlab/show/identity+type|identity type]] | + | nLab: |
+ | [[http://ncatlab.org/nlab/show/identity+type|identity type]] | ||
+ | |||
+ | StackExchange: | ||
+ | [[http://mathoverflow.net/questions/156238/function-extensionality-does-it-make-a-difference-why-would-one-keep-it-out-of | ||
+ | | Andrej Bauer on intentional equality]] | ||
==== Parents ==== | ==== Parents ==== | ||
=== Related === | === Related === | ||
[[Dependent type theory]] | [[Dependent type theory]] |