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Jul
30
reviewed Leave Open Help needed with the integral of an infinite series
Jul
30
reviewed Close Find the centre, foci and asymptotes of the hyperbola
Jul
30
reviewed Leave Open A non-standard form of circle in the complex plane
Jul
30
reviewed Leave Open Is 1 + 1 + 1 … a finite number?
Jul
30
reviewed Leave Open Find the sum of the series $\sum \frac{1}{n(n+1)(n+2)}$
Jul
30
reviewed Close Does number precede structure?
Jul
30
reviewed Leave Open Line Integral: $\int_C{x^2}\:dy$
Jul
30
answered Why formulate continuity in terms of pre-images instead of image?
Jul
30
comment Why is it true that $(a_1 \ a_2 \dots a_r) = (a_1 \ a_r)(a_1 \ a_{r-1})\dots(a_1 \ a_3)(a_1 \ a_2)$?
I somehow feel that this question has been altered beyond recognition, which makes older answer look inadequate ...
Jul
30
comment The product of two prime numbers
Well, if the product has at least three factors ...
Jul
30
answered Why is it true that $(a_1 \ a_2 \dots a_r) = (a_1 \ a_r)(a_1 \ a_{r-1})\dots(a_1 \ a_3)(a_1 \ a_2)$?
Jul
30
comment Does there exist a $z\in \Bbb R$ such that $\sin z=t \in \Bbb T$?
How about $\sin 1$, or in fact $\sin x$ for any $x\in\mathbb Q\setminus\{0\}$?
Jul
30
answered Is it possible to determine if a matrix is not diagonalizable via row operations?
Jul
30
comment Is it possible to determine if a matrix is not diagonalizable via row operations?
The identity matrix itself can be row-reduced to the identity matrix
Jul
30
answered Coin Toss Experiment
Jul
30
comment Approximate function as $x$ tends to infinity
The cases $A=0$ and $A=0,a_1=a_2$ may require special treatment.
Jul
30
answered Solve math then decoding, I'll admit, I'm stumped.
Jul
30
answered Why ordered sequences can be reduced to sets?
Jul
29
comment Help fix this proof.
How to justify $g(x)=x$?
Jul
29
comment Proving that that ${(R \setminus S)\setminus T} \subseteq R \setminus (S \setminus T)$
@BrianTung I assum ethe OP would need to show these as well by considering elements