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Just Browsin'


1d
asked A wish for co-ordinate independent conic properties and utilities of polars.
Jan
18
reviewed Approve Are these two statements logically equivalent?
Jan
17
awarded  Nice Question
Jan
16
asked Are there infinitely many pairs of primes where one divides one more than the square of the other?
Dec
31
answered Let $p$ be an odd prime number. How many $p$-element subsets of $\{1,2,3,4, \ldots, 2p\}$ have sums divisible by $p$?
Dec
9
awarded  Caucus
Dec
9
awarded  Popular Question
Nov
26
comment Two questions on number 2013
@Lokesh: Robert Israel clarified it. Both -3 and 3 are odd numbers. So adding the plus or minus sign is not going to change their oddness or evenness. In other words, 'Sum of an odd number of odd numbers is odd.'
Nov
26
comment Two questions on number 2013
@lokeshsangabattula: I doubt people are going to spell out every detail here. Alistair has given an answer so that you can compare it to yours. Try to write out all the elements of the set $S_{2013}$. You can easily guess it by seeing the pattern and then prove your guess by induction.
Nov
6
accepted Maximal commutative subring of the ring of $2 \times 2$ matrices over the reals
Nov
6
accepted An identity that is always an integer
Nov
5
comment A contest inequality
I have tried that.The case with 2 is trivial. Even with just two terms(case where 2014 is replaced by 4),I have no idea what to do.
Oct
1
awarded  Popular Question
Sep
30
awarded  Explainer
Sep
29
awarded  Tumbleweed
Sep
28
awarded  Yearling
Sep
26
comment Given $f:[0,1]\to[0,1]$ and $q:[0,1]\to\mathbb{R}$, is there a $g$ such that $q(f(x))\equiv g(q(x))$?
The commutative diagram in the title is very disconcerting.
Sep
24
awarded  Autobiographer
Sep
23
comment What Gauss *could* have meant?
In the spirit of Gauss' quotes, I would have replied "The result was apparent to me immediately: but I do not yet know how I am to arrive at them."
Sep
22
asked Pre-requisites for 'The Concept of a Riemann Surface'