A quantity z = f ( x , y ), which is a function of two variables x and y , is said to be inversely proportional to x and y when it is proportional to y when x is fixed, and proportional to x when y is fixed. If a = f (1, 1) then z = axy . For example, there are many quantities that are inversely proportional, such as the amount transported being proportional to weight and distance, or momentum being proportional to mass and speed. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
2変数 x と y の関数になる量 z=f(x,y) が,x を固定したときには y に比例し,y を固定したときには x に比例するとき,x と y に複比例するという。ここで a=f(1,1) とすると z=axy になる。たとえば,輸送量は重量と距離に比例するとか,運動量は質量と速度に比例するとか,複比例する量は多い。
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