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# The First Second Mapping

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Topology
Sets and Functions (XXX)
Functions

Consider an arbitrary mapping f : X -->Y.
Prove the main property of the second set mapping:

f^(-1)(Ui Bi) = Ui f^(-1)(Bi)

See the attached file.

##### Solution Summary

This is mainly for proving the first second mapping : f^(-1) (Ui Bi) = Ui f^(-1) (Bi) ,
The solution is given in detail.

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###### Education
• BSc, Manipur University
• MSc, Kanpur University
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