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Is my duality principle proof correct?

Thread starter woundedtiger4
Start date Jun 15, 2013
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Duality Principle

2 replies · 2K views · last reply Jun 16, 2013

woundedtiger4

Thread starter
Jun 15, 2013

#1

Have i done it correctly?

Handwritten proof in red ink on lined paper of R minus the intersection of A_alpha equals the union over alpha of (R minus A_alpha), beginning Suppose x is in R minus the intersection, and ending Hence x is in the union, QED.

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haruspex

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Jun 15, 2013

#2

A better wording (after "i.e.") would be that there exists i such that x belongs to A_i, etc.

woundedtiger4

Jun 16, 2013

#3

haruspex said:

A better wording (after "i.e.") would be that there exists i such that x belongs to A_i, etc.

Thanks

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