# flapjackery

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bio website location age member for 2 years, 5 months seen Aug 19 at 1:04 profile views 18

# 20 Questions

 4 Proof involving matrix inverse of: $\|A^{-1}\|_\infty \ge \frac{\|U^{-1}\|_\infty}{n}$ 3 Evaluate the limit: $\lim_{(x,y,z)\to(0,0,0)}\frac{xy+yz^2+xz^2}{x^2+y^2+z^4}$ 3 Limit of two variables, proposed solution check 3 How to evaluate $\lim_{(x,y)\to(0,0)}\frac{y^2\sin^2x}{x^4+y^4}$ 2 Prove $A \subset \emptyset \iff A = \emptyset$

# 158 Reputation

 +5 Prove: If $A \subseteq B$ and $B \subseteq C$, then $A \subseteq C$. +10 Prove $A \subset \emptyset \iff A = \emptyset$ +10 Please show $|\sin(n+1)x| = |\sin(nx+x)|$ +5 Limit of two variables, proposed solution check

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# 25 Tags

 0 statistics × 6 0 proof-writing × 2 0 multivariable-calculus × 5 0 elementary-set-theory × 2 0 probability × 5 0 probability-distributions × 2 0 linear-algebra × 3 0 probability-theory 0 proof-verification × 3 0 proof-strategy

# 4 Accounts

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