Reputation
3,288
Next privilege 5,000 Rep.
Approve tag wiki edits
Badges
12 30
Newest
 Nice Answer
Impact
~72k people reached

15h
comment Difference between ${2\over 9}$ and ${22\over 99}$?
calculate their difference!
1d
comment Prove that the Mandelbrot Set Is A Closed Set
the intersection of closed sets is closed.
Jul
31
reviewed Reject Second differential of the norm in an infinite dimensional Hilbert space
Jul
27
comment Weird Induction…?
your second formula is apparerently wong: it says that $\binom{n + k + 1}{k}$ is constant, independent of $k$. So check your formula, you made an error. It is $$\sum_{i = 0}^{k} \binom{n + i}{i} = \binom{n + k + 1}{k}$$ for $0 \leq k \leq n$
Jul
16
revised Calculate 2000! (mod 2003)
latex, mod
Jul
16
comment Calculate 2000! (mod 2003)
Of course you have to prove that 2003 is a prime otherwise you can't be sure that the result is true.
Jul
16
reviewed Approve Counting chain maps
Jul
13
revised Solving the Logarithmic equation $\log_x (3-2\sqrt2)=2$
latex, title
Jul
12
reviewed Approve Cauchy-Schwarz inequality proof (but not the usual one)
Jul
10
reviewed Approve $R^2\setminus K, K$ compact, is not simply connected
Jul
10
revised $R^2\setminus K, K$ compact, is not simply connected
latex symbol
Jul
10
revised Exercise 1 on page 10 in Naive Set Theory, following Axiom of Pairing
some missing formulas added
Jul
10
revised Exercise 1 on page 10 in Naive Set Theory, following Axiom of Pairing
typo
Jul
10
revised Exercise 1 on page 10 in Naive Set Theory, following Axiom of Pairing
added 171 characters in body
Jul
10
answered Exercise 1 on page 10 in Naive Set Theory, following Axiom of Pairing
Jul
10
comment Interchanging order of summation mechanically
"No thinking required here, just algebra" is not true. Actually your result is ok. But if you dont know if the rules that you apply are allowed, you dont know if the result is true. Simply doing some algebra on parts of yor graphic (your summation formula) does not guarantee a correct result
Jul
10
comment Interchanging order of summation mechanically
you are interchanging two lim operation. Can you tell me why this is allowed here?
Jul
10
comment Interchanging order of summation mechanically
The $i$ in your first and second formula does not make sense to me. Is this a constant?
Jul
8
comment Set theory formula
Tjis may be a useful advice for the OP but it is not an answer to the question.
Jul
7
revised Find integer solution of sysem of quadratic equations
edited title