分類證明(粵拼:Fan1 leoi6 zing3 ming4;英文:Proof by exhaustion,或者 Proof by cases)係咁多種證明方法之一。當一個命題出現多個可能嘅時候,就可以將佢分做個案(Case),再睇下每個個案出嚟嘅結果。利用分類證明嘅定理包括咗四色問題(Four Colour Problem)。
要求:證明「任何整數 , 係一個單數。」
如果 係雙數
如果 係單數
因為整數一係單數一係雙數,而喺以上兩個個案入面 都係一個單數,所以「任何整數 , 係一個單數。」呢句命題成立。
以下嘅定理可以用分類證明簡單咁證出嚟。
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