短語詞組短語quotient surjection 商滿射natural surjection 自然滿射surjection theorem 滿射定理canonical surjection [數(shù)]標(biāo)準(zhǔn)滿射fuzzy surjection fuzzy 滿射homomorphic surjection 同態(tài)滿射natural l surjection 自然滿射 返回 surjection