num thy 1 Sections StandardLIB Doc
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Def Preorder(T;x,y.R(x;y)) == Refl(T;x,y.R(x;y)) & (Trans x,y:T. R(x;y))

is mentioned by

Thm* Preorder(;x,y.x | y)[divides_preorder]

In prior sections: rel 1

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num thy 1 Sections StandardLIB Doc