# I'mtoo

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Interested in Mathematics and Computer science esp. Mathematical Logic.

 4 How does a non-mathematician go about publishing a proof in a way that ensures it to be up to the mathematical community's standards? 3 $A=\{1,2,3,4,5\}$, $B=\{1,2\}$ How many functions $f:A\rightarrow B$ exists 2 Inverse Function of $f(x) = \frac{1-x^3}{x^3}$ 2 How to determine which equality sign to use for $x(2x+7) > 0$ 2 How to factor $2x^2-x-3$?

# 431 Reputation

 +10 Why is $\frac{1}{\frac{1}{X}}=X$? +10 Why is it that $2^{10} + 2^{9} + 2^{8} + \cdots + 2^{3} + 2^2 + 2^1 = 2^{11} - 2$? +5 Prove that $\Gamma_I(\frac{M}{\Gamma_I(M)})=0$ +5 Is a subgroup $H$ of a group $G$ normal if $g^2 \in H$ for all $g \in G$?

# 5 Questions

 7 Is a subgroup $H$ of a group $G$ normal if $g^2 \in H$ for all $g \in G$? 5 Prove that $\Gamma_I(\frac{M}{\Gamma_I(M)})=0$ 3 Strictly decreasing function $f(n)>f(n+1)$ is not definable in $\mathbb{N}$ (Set Theoretic (Neumann's) construction of $\mathbb{N}$). 2 What is the general term of this recursive sequence? 0 Describe the elements of $I^n$

# 27 Tags

 6 algebra-precalculus × 3 4 publishing 5 combinatorics × 3 4 proof-writing 4 inverse × 2 3 discrete-mathematics 4 advice 2 factoring 4 soft-question 2 functions

# 17 Accounts

 Mathematics 431 rep 110 Seasoned Advice 101 rep Photography 101 rep TeX - LaTeX 101 rep English Language & Usage 101 rep