Interaction between functional analysis, harmonic analysis, by Nigel Kalton, Elias Saab, Stephen Montgomery-Smith

By Nigel Kalton, Elias Saab, Stephen Montgomery-Smith

In line with the convention at the interplay among sensible research, Harmonic research, and likelihood thought, held lately on the collage of Missouri;Columbia, this informative reference bargains up to date discussions of every designated field;probability thought and harmonic and useful analysis;and integrates issues universal to every.

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1. ) be an enumeration of the rationals in (0, 1). Suppose that E is small, and choose an open interval I n = (a n , b„) such that r„ E I„ c (0, 1) and A( /„) = b„ a„<€2 ”. Put A = VD, = , In . By subadditivity, 0 0. If B = (0, 1) — A then 1 — E < A(B) < 1. The set B contains no interval and is in fact nowhere dense [A15].

Hence (A 2 ). Although a cr-field is a A-system, the reverse is not true (in a four-point space take f to consist of 0, SI, and the six two-point sets). But the connection is close: . Lemma 6. A class that is both a 7r -system and a A-system is a a-field. The class contains SI by (A 1 ) and is closed under the formation of complements and finite intersections by (A 2 ) and (ar). It is therefore a field. It is a cr-field because if it contains sets A n , then it also contains the disjoint sets B n = A n n A i n • • .

Let 9_ cr( o ). By Lemmas 3 and 4, 1 PROOF OF EXTENSION IN THEOREM ,Fo c g-c„llc 2 n . 7), P*(SZ) = P(SZ) = 1. By Lemma 3, P* (which is defined on all of 2 n ) restricted to 4' is therefore a probability measure there. And then P* further restricted to . is clearly a probability measure on that class as well. 21 , SECTION 3. 7) it agrees with • P on Yo . 1 is unique requires some auxiliary concepts. A class g3 of subsets of 1 is a Tr-system if it is closed under the formation of finite intersections: (7r) A, B E implies A n B EY.

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