[理工] [離散]-證明等價關係

[fj90406 (阿亮)]

Let A = Z+ * Z+ a relation R on A as follows:
    (x,y)R(u,v) if and only if x*v=y*u.

(1) Prove that R is an equivalent relation.
(2) Computer the equivalence class of (5,4)

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