Proposition 2.43. Let X be a space with topology T and B a subcollection of T such that for all U E T, for all x E U, there exists B E B such that x E B CU. Then B is a basis that generates the topology T on X.

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Please solve proposition 2.43 in DETAIL. i posted this earlier and someone posted the wrong answer from CHEGG, so please dont do that. only attempt if you know the answer.

 

Definition 2.41. A set B is a basis for a topology on a set X provided B satisfies the
following axioms:
(1) UB = X.
(2) VB1, B2 E B, Vx E B1 N B2,3B3 E B, x E B3 C BỊN B2.
%3D
The topology T on X generated by B is defined by
T:= {UC X |3C C B,U = UC}.
In other words, U eT iff U is a union of elements of B.
Exercise 2.42. Show that: (1) The topology generated by a basis is a topology. (2) The
sets in the basis are open sets in that topology.
Proposition 2.43. Let X be a space with topology T and B a subcollection of T such that
for all U ET, for all x E U, there exists B E B such that x E B CU. Then B is a basis
that generates the topology T on X.
Transcribed Image Text:Definition 2.41. A set B is a basis for a topology on a set X provided B satisfies the following axioms: (1) UB = X. (2) VB1, B2 E B, Vx E B1 N B2,3B3 E B, x E B3 C BỊN B2. %3D The topology T on X generated by B is defined by T:= {UC X |3C C B,U = UC}. In other words, U eT iff U is a union of elements of B. Exercise 2.42. Show that: (1) The topology generated by a basis is a topology. (2) The sets in the basis are open sets in that topology. Proposition 2.43. Let X be a space with topology T and B a subcollection of T such that for all U ET, for all x E U, there exists B E B such that x E B CU. Then B is a basis that generates the topology T on X.
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