2014-10-19 15:40:56 +00:00
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show a = c, from H1 ⬝ H2 : a = c
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2014-07-27 04:56:35 +00:00
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------------
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2016-02-29 19:28:20 +00:00
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have e1 : a = b, from H1,
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2014-10-19 15:40:56 +00:00
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have e2 : a = c, from e1 ⬝ H2,
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2015-05-08 18:11:00 +00:00
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have e3 : c = a, from e2⁻¹,
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2016-02-29 19:28:20 +00:00
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have e4 : b = a, from e1⁻¹,
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2015-05-08 18:11:00 +00:00
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show b = c, from e1⁻¹ ⬝ e2 :
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2014-10-19 15:40:56 +00:00
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b = c
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