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Let A subset B, C subset D, then prove t...

Let `A subset B, C subset D`, then prove that `A xx C subset B xx D`

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Verified by Experts

Let `(a, c) in A x C`
`a in A` and `c in C`
`rarr a in B` and `c in D rarr(a, c) in B x D`
`therefore A x `D`
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