1,097 reputation
1510
bio website
location
age
visits member for 2 years, 10 months
seen 17 hours ago

1d
answered Calculate $n$ points having equal cartesian distance over a single sine wave
Aug
29
revised finding volume of the cone by using the dot product
added 48 characters in body
Aug
29
comment finding volume of the cone by using the dot product
@harry it's actually $u \angle v$
Aug
29
comment finding volume of the cone by using the dot product
the sine and cosine of the angle between $u$ and $v$ resp.
Aug
29
answered finding volume of the cone by using the dot product
Aug
27
comment Evaluating $\ln(\cos x))$ using Taylor expansion
you should be using different unknowns, now the $x$ in the $\ln$ expansion is different from the $x$ in $\cos x$
Aug
21
revised The process of solving the inequality $\frac{8}{19} x\ge -1$
corrected equations
Aug
21
suggested suggested edit on The process of solving the inequality $\frac{8}{19} x\ge -1$
Jul
10
comment How to create circles and or sections of a circle when the centre is inaccessible
and your print screen button doesn't work?
May
19
comment Number of ways to order numbers such that greatest number proceeds smallest number
which is equal to $\frac{n!}{2}$
May
17
answered What did Johann Bernoulli wrong in his proof of $\ln z=\ln (-z)$?
May
16
comment Proving that all eigenvalues are $0$ bar one.
it's sufficient to prove that all $Ax=a\mathbf{e}$
Apr
17
comment Why does $n^0 = 1$?
there is $$ n^k = \Pi^k_{i=1}i$$ but that relies on $$ \Pi^0_{i=1}i=0$$
Apr
10
comment Visually deceptive “proofs” which are mathematically wrong
result of the assumption that $\sqrt b \cdot \sqrt a = \sqrt{a\cdot b}$ for all reals $a$ and $b$ instead of only for positive reals
Apr
7
comment Visually deceptive “proofs” which are mathematically wrong
all of the answers below rely on a slight bend in a diagonal line which accounts for the missing area
Apr
4
answered Can a coin with an unknown bias be treated as fair?
Mar
18
comment Minimum number of different clues in a Sudoku
must resist urge to solve sudoku...
Mar
13
comment What is wrong in this proof?
or a square of a negative number; the logarithm of a negative number, those are the most common but any multivalued function can be used
Mar
4
comment For all square matrices A and B of the same size, it is true that (A+B)^2 = A^2 + 2AB + B^2
@Nicholas because distributiveness works even when $AB\ne BA$ (it's not related)
Feb
26
comment What are some interesting cases of $\pi$ appearing in situations that are not / do not seem geometric?
isn't this the just the series expansion of $\arctan 1$?