User Ivan Neretin - Chemistry Stack Exchange

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Ivan Neretin

PhD in physical chemistry.

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Moscow, Russia
Member for 3 years, 7 months
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22 Let $p_1, p_2,\dots,p_n$ be polynomials of $k$ variables $x_1,\dots,x_k$ and $p_1^2 + \dots +p_n^2=x_1^2 + \dots + x_k^2$ Prove that $n \geq k$.
16 Identify $C\approx1.29$ the limit of $\left(\pi - 2^n \sqrt{2-\sqrt{2+\cdots+\sqrt 2}}\right)\cdot 4^n$
16 $a_n$ is the smallest positive integer number such that $\sqrt{a_n+\sqrt{a_{n-1}+...+\sqrt{a_1}}}$ is positive integer
12 solve this diophantine equation: ${\rm lcm}[x,y]+{\rm lcm}[y,z]+{\rm lcm}[z,x]=3(x+y+z)$
11 Find all the prime factors of $1000027$
9 Show that there are no integers $x, y$ such that $x^{2015} - y^{2016} = 2115$
8 How to solve $f(f(x)) = x$?
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physical-chemistry

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organic-chemistry

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thermodynamics

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inorganic-chemistry

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water

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aqueous-solution

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Top Posts (339) All Questions Answers | Votes Newest

136 Why is absolute zero unattainable? Oct 13 '16

43 What does the circle inscribed in a benzene ring represent? Feb 25 '16

41 Has a carbon compound ever been found having an ionic bond? Nov 12 '15

39 Does the mass of sulfur really decrease when dissolved in water and increase when burnt? Oct 28 '16

38 What happens to a molecule while it is reacting? Aug 3 '16

37 Is there radioactivity at absolute zero? Oct 19 '18

33 How does water evaporate completely when at room temperature? Oct 15 '17

24 Why is the melting point of PCl3 less than that of PCl5? Dec 11 '17

24 What happens when an electron in a metal is excited? Nov 13 '17

21 What is the strongest oxidising agent? Oct 4 '18

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