| 单词 | commutativity |
| 释义 | commutativityenUKcom·mu·ta·tiveC0520000 (kŏm′yə-tā′tĭv, kə-myo͞o′tə-tĭv)commutativity(kəˌmjuːtəˈtɪvɪtɪ)CommutativityenUKCommutativitya property of the addition and multiplication of numbers expressed by the identities a + b = b + a and ab = ba. In a more general sense, the operation a * b is termed commutative if a * b = b *a. Addition and multiplication of polynomials, for example, have the property of commutativity; vector multiplication (see VECTOR PRODUCT) is not commutative since [a,b] = — [b,a]. |
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