Measure Theory
نویسنده
چکیده
We always denote by X our universe, i.e. all the sets we shall consider are subsets of X. Recall some standard notation. 2 everywhere denotes the set of all subsets of a given set X. If A ∩ B = ∅ then we often write A t B rather than A ∪ B, to underline the disjointness. The complement (in X) of a set A is denoted by A. By A4B the symmetric difference of A and B is denoted, i.e. A4B = (A \B) ∪ (B \A). Letters i, j, k always denote positive integers. The sign is used for restriction of a function (operator etc.) to a subset (subspace).
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