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Prove that every first countable space is second countable


Determine all topologies on a set X ={a,b,c}


Let X be a infinite set with cofinite topology .prove that any bijection from X to X is a homeomorphism
Prove that the inverse of a.homeomorphism is also a.homeomorphism

Prove that a function f from a metric space X to a metric space Y is continuous if and only if the inverse image of any open subset of Y is open in X


Prove that the subspace.of a complete metric is complete if and only if it is closed


Give an example of two metric on R2 which are equivalent ,substantiate your claim


Prove or disaprove ,The closure of an open vall in a metric space.is the corresponding closed ball
Determine the closed subsets of a.set X with the discrete metric
Give an example of a locally connected space which is not connected substantiate your claim.
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