21 lines
593 B
Text
21 lines
593 B
Text
import homotopy.circle
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open circle eq int pi
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attribute circle.rec [recursor]
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protected definition my_decode {x : circle} (c : circle.code x) : base = x :=
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begin
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induction x,
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{ revert c, exact power loop },
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{ apply arrow_pathover_left, intro b, apply concato_eq, apply pathover_eq_r,
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rewrite [power_con,transport_code_loop]},
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end
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protected definition my_decode' {x : circle} : circle.code x → base = x :=
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begin
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induction x,
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{ exact power loop},
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{ apply arrow_pathover_left, intro b, apply concato_eq, apply pathover_eq_r,
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rewrite [power_con,transport_code_loop]},
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end
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