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Property 4

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Property 4

Hi, a simpler proof:

a < b implies (by 3) that ac < bc.

c < d implies (by 3) that bc < bd.

The transitivity then gives that ac < bd.

Parting words from the person who closed the correction: 
Hi, a simpler proof: a < b implies (by 3) that ac < bc. c < d implies (by 3) that bc < bd. The transitivity then gives that ac < bd. That is a lot nicer than what I had!
Status: Accepted
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