Direct Proofs

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In this first video in our mathematical proof series, (the slightly injured) Ben discusses direct proofs and shows two examples.
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You just made my life a little bit easier! Thank you.

tlhomotsemoteme
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Excellent video! proofs are my favorite part of maths!

pauloat
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Excellent - thanks! I see they've just started introducing this into A'level maths edexcel

choppedskin
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That last part of the 2nd example after we are at -a(n+m). i dont get how that shows a|b+c

wendya
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