Franceia
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Questions (5)

 5 Prove or disprove: if A is a subset of B and B is not a subset of C, then A is not a subset of C 2 How to prove that if $A\cap B' =\varnothing$ then $A \subseteq B$? 1 How to simplify this square $(3 \times 4 + 2)^2$? 1 How does expanding $(2s+1)^2$ help us prove “$n^2$ even $\implies$ $n$ even”? 0 Can I prove (if $n^2$ is even then $n$ is even) directly?

Reputation (69)

 +5 How to simplify this square $(3 \times 4 + 2)^2$? +20 How does expanding $(2s+1)^2$ help us prove “$n^2$ even $\implies$ $n$ even”? +10 How to prove that if $A\cap B' =\varnothing$ then $A \subseteq B$? +5 Prove or disprove: if A is a subset of B and B is not a subset of C, then A is not a subset of C

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Tags (6)

 0 elementary-number-theory × 2 0 algebra-precalculus 0 proof-strategy 0 discrete-mathematics 0 proof-writing 0 elementary-set-theory

Account (1)

 Mathematics 69 rep 16