11 lines
No EOL
274 B
Text
11 lines
No EOL
274 B
Text
VISIT consume_args.lean
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SYNC 7
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import logic data.nat.basic
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open nat eq.ops
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theorem tst (a b c : nat) : a + b + c = a + c + b :=
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calc a + b + c = a + (b + c) : !add.assoc
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... = a + (c + b) : {!add.comm}
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... = a + c + b : (!add.assoc)⁻¹
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WAIT
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INFO 7 |