8 lines
273 B
Text
8 lines
273 B
Text
assert e1 : a = b, from H1,
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have e2 : a = c, from e1 ⬝ H2,
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have e3 : c = a, from e2⁻¹,
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assert e4 : b = a, from e1⁻¹,
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have e5 : b = c, from e4 ⬝ e2,
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have e6 : a = a, from H1 ⬝ H2 ⬝ H2⁻¹ ⬝ H1⁻¹ ⬝ H1 ⬝ H2 ⬝ H2⁻¹ ⬝ H1⁻¹,
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e3 ⬝ e2 :
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c = c
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