In chapter ii, first, we give a concise account of the theory of algebraic invariant . second, by using the methods of algebraic invariants, we get the classifications of fifth-order binary forms 第二章首先簡(jiǎn)單介紹代數(shù)不變式思想;然后利用代數(shù)不變式的思想,對(duì)二元五次代數(shù)多項(xiàng)式進(jìn)行代數(shù)分類(lèi);最后由此得到系統(tǒng)的12種標(biāo)準(zhǔn)形。