Let `A sub B` We have to show that `C- B sub - A ` Let `x in C-B` `rArr x in C and x notin B` `rArr x in C and x notin A [therefore A sub B]` `rArr x in C- A ` `therefore C- B sub C- A `
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CENGAGE-SET THEORY AND REAL NUMBER SYSTEM -Archieves
