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Show that if A subB , then C" "" "BsubC"...

Show that if `A subB` , then `C" "" "BsubC" "" "A` .

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Let `A sub B`
Let `x in (C-B)rArrx inC and cancel(in)B`
`rArr x in C and cancel(in)A (becauseA subB)`
`rArr x in (C-A)`
`rArr (C-B) sub(C-A)`.
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