Question

Discrete Math Course. Prove with the element method or analytical method using identities from p.355. or disprove with a counter example AXB ⊆ AXC then B ⊆ C

Answer #1

**True . **We will prove it by element
method .

**Proof :** First we choose an element from
say
.

Let .

[ since ]

and

So implies ,

Hence ,

.

.

.

If you have any doubt please comment .

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