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19 lines
327 B
Plaintext
19 lines
327 B
Plaintext
2 years ago
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import TestGame.Metadata
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import Mathlib
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-- -- INCORPORATED
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-- example (A B : Prop) : (A → B) ↔ (¬ B → ¬A) := by
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-- constructor
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-- intro h nb
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-- by_contra
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-- have : B
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-- apply h
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-- assumption
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-- contradiction
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-- intro h a
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-- by_contra
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-- have : ¬ A
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-- apply h
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-- assumption
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-- contradiction
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