8 lines
224 B
Text
8 lines
224 B
Text
section bug
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variables (x y z : Type)
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variables (f : x → y) (g : y → z)
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variables (xy : set (x → y)) (yz : set (y → z)) (xz : set (x → z))
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--#check f ∈ xy
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--#check g ∈ yz
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#check (g ∘ f) ∈ xz --error
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end bug
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