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fix(doc): fix confusion between Prop and Bool

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this fix assumes that Prop and Bool are two different things but even if they were the same thing, using the two names would only confuse the reader
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Théo Zimmermann 2015-07-30 19:00:26 +02:00 committed by Leonardo de Moura
parent 923d12553e
commit 698b368f01
1 changed files with 1 additions and 1 deletions
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doc/lean/tutorial.org
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@ -709,7 +709,7 @@ for =∃ a : nat, a = w= using
Note that =exists.intro= also has implicit arguments. For example, Lean has to infer the implicit argument
=P : A → Bool=, a predicate (aka function to Prop). This creates complications. For example, suppose
=P : A → Prop=, a predicate (aka function to Prop). This creates complications. For example, suppose
we have =Hg : g 0 0 = 0= and we invoke =exists.intro 0 Hg=. There are different possible values for =P=.
Each possible value corresponds to a different theorem: =∃ x, g x x = x=, =∃ x, g x x = 0=,
=∃ x, g x 0 = x=, etc. Lean uses the context where =exists.intro= occurs to infer the users intent.