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Answers for “为什么构造 $x+1$ 会在第一个证明中产生矛盾?”

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In this video, PBC stands for "proof by contradiction." It is a mathematical method used to prove a statement by assuming the opposite of the desired statement and deriving an inconsistency or contradiction. The video explicitly abbreviates "proof by contradiction" as "Pbc." on the page before starting the first example.

Conditions: The context is a mathematical proof.; The method involves assuming the negation of the target statement.