(adsbygoogle = window.adsbygoogle || []).push({}); Proving an "or" statement

What is the general procedure when proving a statement like "A implies B or C"? Is it more common to assume A and then split into cases (i.e. case 1: A implies B, case 2: A implies C, therefore A implies B or C)? Or is it more common to assume A and that one of B or C is false and then prove that A implies C or B (depending on which is assumed false)?

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# Proving an or statement

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