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 就数学是否科学问题答实话实说先生 |
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就数学是否科学问题答实话实说先生 -- 芦笛 - (1513 Byte) 2004-8-19 周四, 下午9:52 (1076 reads) |
实话实说！！！
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作者：Anonymous 在 罕见奇谈 发贴, 来自 http://www.hjclub.org
还得请先生说出统计学（数学的一支）“的出现根本不是什么自然现像或生产发展需要使然”，
先生说"您才不会在数学里找到什么“定律”(law)，只会找到“定理”(theorium, or something like that, I cannot remember)"
我帮您找了些来。
commutative law, Mathematics
Related Category: Mathematics
commutative law, in mathematics, law holding that for a given binary operation (combining two quantities) the order of the quantities is arbitrary; e.g., in addition, the numbers 2 and 5 can be combined as 2+5=7 or as 5+2=7. More generally, in addition, for any two numbers a and b the commutative law is expressed as a+b=b+a. Multiplication of numbers is also commutative, i.e., a×b=b×a. In general, any binary operation, symbolized by , joining mathematical entities A and B obeys the commutative law if AB=BA for all possible choices of A and B. Not all operations are commutative; e.g., subtraction is not since 2-5≠5-2, and division is not since 2/5 ≠ 5/2 .
distributive law, Mathematics
Related Category: Mathematics
distributive law. In mathematics, given any two operations, symbolized by * and , the first operation, *, is distributive over the second, , if a*(bc)=(a*b)(a*c) for all possible choices of a, b, and c. Multiplication, ×, is distributive over addition, +, since for any numbers a, b, and c, a×(b+c)=(a×b)+(a×c). For example, for the numbers 2, 3, and 4, 2×(3+4)=14 and (2×3)+(2×4)=14, meaning that 2×(3+4)=(2×3)+(2×4). Strictly speaking, this law expresses only left distributivity, i.e., a is distributed from the left side of (b+c); the corresponding definition for right distributivity is (a+b)×c=(a×c)+(b×c).
作者：Anonymous 在 罕见奇谈 发贴, 来自 http://www.hjclub.org |
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