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import TestGame.Metadata
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import Std.Tactic.RCases
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import Mathlib.Tactic.LeftRight
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import TestGame.ToBePorted
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Game "TestGame"
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World "Proposition"
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Level 9
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Title "Widerspruch"
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Introduction
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"
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Auftritt dritter Querulant.
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"
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Statement ""
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(n : ℕ) (h : n = 10) (g : n ≠ 10) : n = 42 := by
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Hint "**Du** Wieder ein Widerspruch in den Annahmen?
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**Robo** Ich sehe, du hast langsam den Dreh raus."
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contradiction
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Conclusion
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"
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**Robo** Gut gemacht. Bei dieser Frage ist auch ein bisschen offensichtlicher,
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worin der Widerspruch besteht: Die Annahme `n ≠ 10` ist genau die Negation von `n = 10`.
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Man muss `≠` immer als `¬(· = ·)` lesen.
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"
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NewTactic contradiction
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DisabledTactic tauto
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