數學中,齊次多項式是指各項的總次數均相同的多項式 ,例如 就是一個五次的雙變數齊次多項式,其各項的總次數都是五。

齊次多項式有時也稱作代數形式形式。二次齊次多項式是二次型,在特徵不等於二的(如實數複數域)上可以用對稱矩陣表示。代數形式的理論很廣,並在數學及物理中有大量應用。

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