Using Axiomatic Semantics, prove   z = x - y;   z = y - x;   are not equivalent unless the two operands are equal. first establish the pre or post condition and then use the axiom of assignments. be precise with a formal proof.

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Using Axiomatic Semantics, prove

 

z = x - y;

 

z = y - x;

 

are not equivalent unless the two operands are equal. first establish the pre or post condition and then use the axiom of assignments. be precise with a formal proof.

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