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 4 If $R$ and $S$ are fields, either prove or disprove that $R\times S$ is a field 4 $m$ is a perfect square iff $m$ has an odd number of divisors? 3 Solve equation $\sqrt{4t + 1} = 3 - 3t$ 3 Order of kernel of a homomorphism. 2 Does limit means replacing $x$ for a number?

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 +30 $m$ is a perfect square iff $m$ has an odd number of divisors? +2 Dihedral group as a direct product +8 Set prove homework problem +10 Solve equation $\sqrt{4t + 1} = 3 - 3t$

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 0 A congruence in multiple variables

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 7 abstract-algebra × 2 2 calculus 6 elementary-number-theory × 5 2 limits 4 finite-groups × 2 1 discrete-mathematics × 2 3 algebra-precalculus 1 combinatorial-group-theory 2 elementary-set-theory × 2 1 group-theory

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