当且仅当 meaning in English
[计算机] if and only if; when and only when; iff
◇当且仅当操作 if and only if operation; 当且仅当运算 if and only if operation
Examples
- An edge is a bridge if it is not contained in a cycle .
一条边是桥当且仅当它不包含在圈中。 - Positive semi-definite matrices are positive definite if and only if they are nonsingular .
正半定矩阵是正定的，当且仅当它们是非奇异矩阵。 - Two sets are said to be equivalent if and only if they can be placed in one-to-one correspondence .
当且仅当两个集合中的元素一一对应时，才称它们为等势。 - Is a unary operator that negates its operand . it is defined for
定义了该运算符，当且仅当操作数为 - A node - set is true if and only if it is non - empty
一个节点当且仅当它不是空节点时，表达式的值为真。