# AHH

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bio website math.stackexchange.com/users/… location age member for 2 years, 7 months seen Mar 10 at 1:20 profile views 63

Mathematics Teacher

 3 Questions about Divisibility of $2^n$ by $3$ 3 Which is larger :: $y!$ or $x^y$, for numbers $x,y$. 3 $i^2$ why is it $-1$ when you can show it is $1$? 2 Calculate tangent of $f(x) = x^4 -2x^2 - x$ 2 How to calculate the ⌉ operator?

# 400 Reputation

 +20 $i^2$ why is it $-1$ when you can show it is $1$? +5 Prove or disprove: $(\mathbb{Q}, +)$ is isomorphic to $(\mathbb{Z} \times \mathbb{Z}, +)$? +15 If $\lim_{x\rightarrow a} f(x) = 0$, and $\lim_{x\rightarrow a} g(x) = \infty$, show that $\lim_{x\rightarrow a} f(x)^{g(x)} = 0$ +5 Does $\zeta(-1)=-1/12$ or $\zeta(-1) \to -1/12$?

# 2 Questions

 10 Prove or disprove: $(\mathbb{Q}, +)$ is isomorphic to $(\mathbb{Z} \times \mathbb{Z}, +)$? 1 Does $\zeta(-1)=-1/12$ or $\zeta(-1) \to -1/12$? [duplicate]

# 29 Tags

 7 elementary-number-theory × 4 3 exponentiation 5 inequality × 2 3 factorial 4 algebra-precalculus × 4 3 fake-proofs 4 arithmetic × 2 3 prime-factorization 3 complex-numbers 3 proof-strategy

# 3 Accounts

 Mathematics 400 rep 111 MathOverflow 101 rep 1 Area 51 101 rep