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- A node-set is true if and only if it is non-empty. 一個節點當且僅當它不是空節點時,表達式的值為真。
- A string is true if and only if its length is non-zero. 字元串的值為真的充分必要條件就是字元串的長度不為零。
- Declare it as Shared if and only if you define it inside a class. 當且僅當在類中定義此過程時,才將其聲明為Shared。
- Theorem 1 and are equivalent infinitesimals if and only if . 定理1與是等階無窮小的充分必要條件為.
- Every thing has its solution, if and only if you can be farseeing. 每個問題都有其解決之道,只要你把目光放得遠一點!
- The Boolean operation whose result has the Boolean value 0 if and only if each operand has the Boolean value 0. 一種布爾運算,當且僅當每個操作數都具有布爾值0時,其結果才具有布爾值0。
- The dyadic Boolean operation whose result has the Boolean value 0 if and only if the first operand has the Boolean value 0 and the second has the Boolean value 1. 一種二元布爾運算,在這種運算中,當且僅當第一個操作數的布爾值為0,第二個操作數的布爾值為1時,其結果的布爾值才為0。
- The Boolean operation whose result has the Boolean value 1 if and only if each operand has the Boolean value 1. 一種布爾操作,當且僅當每個操作數的布爾值都為1時,它的結果的布爾值為1。
- The dyadic Boolean operation whose result has the Boolean value0 if and only if the first operand has the Boolean value0 and the second has the Boolean value1. 一種二元布爾運算,在這種運算中,當且僅當第一個操作數的布爾值為0,第二個操作數的布爾值為1時,其結果的布爾值才為0。
- The dyadic Boolean operation whose result has the Boolean value1 if and only if the first operand has the Boolean value1 and the second has Boolean value0. 二元布爾運算,當且僅當第一個操作數具有布爾值1,第二個操作數具有布爾值0時,其結果才為布爾值1。
- The dyadic Boolean operation whose result has the Boolean value 1 if and only if the first operand has the Boolean value 1 and the second has Boolean value 0. 二元布爾運算,當且僅當第一個操作數具有布爾值1,第二個操作數具有布爾值0時,其結果才為布爾值1。
- A rational decision maker takes an action if and only if the marginal benefit of the action exceeds the marginal cost. 只有當這個行動帶來邊際利潤超出它的邊際成本時,一個理性的決策制定者才可以實施這個行動。
- Positive semi-definite matrices are positive definite if and only if they are nonsingular. 正半定矩陣是正定的,當且僅當它們是非奇異矩陣。
- Object variables are identical if and only if they refer to the same instance of the same class. 相同類的相同實例。
- Two sets are said to be equivalent if and only if they can be placed in one-to-one correspondence. 當且僅當兩個集合中的元素一一對應時,才稱它們為等勢。
- Hashes of two sets of data should match if and only if the corresponding data also matches. 兩組數據的哈希值僅在相應數據也匹配時才應當匹配。
- Type object references refer to the same object if and only if they represent the same type. 對象引用當且僅當它們表示相同的類型時,才引用相同的對象。
- Numbered logfiles may be moved, but not deleted, if and only if the database file(s) are Consistent. 當且僅當資料庫文件一致時,可以移動已編號的日誌文件,但不能刪除。
- If Char F = p > 0, L is abelian if and only if every (finite-dimensional) irreducible module of L is one-dimensional. 若charF=P>0,則L為交換當且僅當L的任一(有限維)不可約模為1維的;
- A rational decisionmaker takes an action if and only if the marginal benefit of the action exceeds the marginal cost. 如果而且只有一種行動的邊際收益大於邊際成本,一個理性決策者才會採取這項行動。