# Yan Yau

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625
bio website math.stackexchange.com/users/… location Hong Kong age 14 member for 1 year, 3 months seen 20 hours ago profile views 356

I am a 14 year old that loves math and knows quite a bit about it. My dad is a Maths Teacher but I am mostly self-taught with occasional clarifications and help from my dad.

My Favorite Science is Chemistry, with Physics coming very close behind, then Biology at last.

 38 A simple example of an uncountable set that is not $\mathbb{R}$ 7 Is Cantor's diagonal argument dependent on the base used? 7 How to learn mathematics as a beginner 6 Show that $\gcd(a,b)=\operatorname{lcm}(a,b)$ if and only if $a=b$. 5 How does Wolfram Alpha come up with the substitution $x = 2\sin u$? Integration/Analysis

# 1,696 Reputation

 +2 Binomial-coefficients if, k, m, n natural numbers and k \leq n the result of +2 Can this interesting property be proven? +10 $\int_{ABC} f = \int_{CDA} f$ +10 How do I prove that $x^2 ≡ 3 \mod4$ has no solutions?

# 19 Questions

 9 Infinite sets and their Cardinality 8 Why is the Logarithm of a negative number undefined? 7 In What order should I Learn math in? 4 Math Joke about Differentiation 3 How do I prove this function doesn't exist?

# 66 Tags

 45 elementary-set-theory × 6 7 binary 12 elementary-number-theory × 5 7 discrete-mathematics 9 calculus × 12 7 real-numbers 8 soft-question × 7 7 fractions 7 advice × 2 6 limits × 5

# 17 Accounts

 Mathematics 1,696 rep 625 TeX - LaTeX 281 rep 147 Area 51 151 rep 2 Physics 124 rep 18 Ask Different 106 rep 3