Mathematics
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rafa
  • Member for 7 years, 1 month
  • Last seen more than 3 years ago
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69
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7
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10
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7
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10
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All Questions Answers
Score Newest
question
6
Every natural number $n$ can be written as $n=s-t$ with $\omega(s)=\omega(t)$
Jan 11, 2019
question
5
We have $2n+1$ irrational numbers, then exists $n+1$ of them such that every subset of this set with $n+1$ elements has the sum an irrational number.
Nov 6, 2018
question
4
Let consider a square $10$x$10$ and write in the every unit square the numbers from $1$ to $100$
Mar 29, 2019
question
4
$\frac {x_1^3}{y_1}+\frac {x_2^3}{y_3}+\ldots+\frac {x_n^3}{y_n}\leq \frac {a^4+b^4}{ab (a^2+b^2)}(x_1^2+x_2^2+\ldots+x_n^2) $
Sep 15, 2018
question
4
Show that $f=0$ given $\int_{a}^{b} x^n\,f(x)\,dx=0$ [closed]
Jun 22, 2018
question
4
Let $f:\Bbb{R}\to \Bbb{R} $ a continuous function s.t. $f(x+y)+f (x-y)=2f(x)+2f(y) $. Find $f$.
Mar 31, 2018
question
3
Show that $BP+BQ=2PQ $
Nov 11, 2018
question
3
A supplementary construction
May 22, 2018
question
3
Proving that a module is not projective by definition
May 13, 2017
question
3
Is $K $ a $K [X]$ injective module?
May 15, 2017

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