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
True . We will prove it by element method .
Proof : First we choose an element from
say
.
Let .
[ since
]
and
So
implies
,
Hence ,
.
.
.
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