# Han de Bruijn

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bio website alternatievewiskunde.nl location Netherlands age 67 member for 1 year, 3 months seen 13 hours ago profile views 945

A little bit of Physics would be NO Idleness in Mathematics (HdB)

 11 How prove this inequality $(a^2+bc^4)(b^2+ca^4)(c^2+ab^4) \leq 64$ 10 How find this sum $\sum_{ab+cd=2^m}ac=?$ 9 Find Minimum value of $P=\frac{1}{1+2x}+\frac{1}{1+2y}+\frac{3-2xy}{5-x^2-y^2}$ 9 Evaluating the sum $\lim_{n\to \infty}\sqrt[2]{2+\sqrt[3]{2+\sqrt[4]{2+\cdots+\sqrt[n]{2}}}}$ 8 How prove this inequality $\frac{2}{(a+b)(4-ab)}+\frac{2}{(b+c)(4-bc)}+\frac{2}{(a+c)(4-ac)}\ge 1$

# 2,869 Reputation

 +50 Examples of useful, insightful, and interesting hand-waving +8 Closed-form of infinite continued fraction involving factorials +8 How to define the Nabla-Operator +50 Practical applications of first order exact ODE?

# 29 Questions

 11 Why does Group Theory not come in here? 7 Iterated Limits Schizophrenia 6 Can monsters of real analysis be tamed in this way? 5 What is the slope of the tangent at $(0,0)$ on the curve $x^2 y^2 = 4 x^5 + y^3$ 4 What exactly are the curves that are a best fit to the Harmonic Cantilever?

# 127 Tags

 41 inequality × 16 17 limits × 12 37 calculus × 21 15 sequences-and-series × 12 22 number-theory × 3 13 geometry × 13 19 summation × 2 12 numerical-methods × 7 18 optimization × 11 11 nested-radicals × 2

# 1 Account

 Mathematics 2,869 rep 1627