单词	power set
释义	Power Set "The set of all the subsets of a set" Basically we collect all possible subsets of a set. Example: For the set {a,b,c}: • The empty set {} is a subset of {a,b,c} • And these are subsets: {a}, {b} and {c} • And these are subsets: {a,b}, {a,c} and {b,c} • And {a,b,c} is actually a subset of {a,b,c} too And altogether they make the Power Set: P(S) = { {}, {a}, {b}, {c}, {a,b}, {a,c}, {b,c}, {a,b,c} } Which is (yay!) the set of all the subsets of {a,b,c}
随便看	dividends divisible division divisor divisor (of an integer) dodecagon dodecahedron dollar domain of a function dot plot dot product double dozen duodecimal e (euler`s number) earned income eccentric eccentricity edge electronic funds transfer (eft) element elimination ellipse ellipsoid end point

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