L-关系方程T(a,x)=b与方程Ⅰ(a,x)=b 有解的充要条件
L-관계방정T(a,x)=b여방정Ⅰ(a,x)=b 유해적충요조건
The Sufficient and Necessary Condition for the Existence of the Solution of L-Relation Equations T(a,x) = b,I (a,x) = b