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24 lines
371 B
Plaintext
24 lines
371 B
Plaintext
2 years ago
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import TestGame.Metadata
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import Std.Tactic.RCases
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import Mathlib.Tactic.Contrapose
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Game "TestGame"
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World "Contradiction"
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Level 7
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Title "Kontraposition"
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Introduction
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"
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Im Gegensatz zum Widerspruch, wo
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"
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Statement
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"Ein Widerspruch impliziert alles."
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(A B : Prop) (h : ¬ B → ¬ A) (hA : A) : B := by
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revert hA
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contrapose
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assumption
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Tactics contradiction
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