If M is Any Set, Then Write M ∪ ϕ and M ∩ ϕ . - Algebra
If M is any set, then write M ∪ `phi` and M ∩ `phi` .
If M is any set, then
M ∪ `phi` = M
and M ∩ `phi` = `phi`
Concept: Number of Elements in a Set
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