17 lines
221 B
Text
17 lines
221 B
Text
a b c : ℕ,
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H : c = b
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⊢ ℕ
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a b c : ℕ,
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H : c = b,
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v : ℕ := ?m_1
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⊢ a + c = a + b
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------------
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a b c : ℕ,
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H : c = b,
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v : ℕ := a + b
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⊢ a + c = a + b
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------------
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a c : ℕ,
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v : ℕ := a + c
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⊢ a + c = a + c
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