5,782 reputation
21234
bio website plus.google.com/…
location Cambridge, United Kingdom
age 21
visits member for 2 years, 5 months
seen Jul 8 at 14:59

I'm a silly ass.


Jul
3
awarded  Taxonomist
Jul
2
awarded  Curious
Jun
2
comment Characterising functions $f$ that can be written as $f = g \circ g$?
In case you're still wondering about it, a square root for $x\mapsto x^2$ is $x\mapsto x^{\sqrt 2}$.
May
27
awarded  Nice Answer
May
10
comment Determine the ideal of an affine variety
Another, more important point - you haven't actually shown that $I(X)=(x^2-z, xz-y^2)$. Instead, you've shown that $X=I(x^2-z, xz-y^2)$. In other words, $(x^2-z, xz-y^2)$ is an ideal such that every polynomial in it vanishes on $X$ and every point on $X$ satisfies those polynomial equations - but that does not mean that every polynomial that vanishes on $X$ is an element of $(x^2-z, xz-y^2)$.
May
9
comment Determine the ideal of an affine variety
Yes, sorry you're right. I just saw the $k$ in your answer and didn't bother to scroll up to see what had actually been asked in the question.
May
9
reviewed Approve suggested edit on How can I calculate the CDF of this random variable?
May
9
reviewed Approve suggested edit on What is the appropriate probability distribution to model this situation?
May
9
comment Determine the ideal of an affine variety
This answer refers to field elements like $x$ and $z$ being positive. The notion positive is not defined for a general field $k$.
May
6
reviewed Approve suggested edit on How to calculate the Sum of a differential map?
Mar
7
awarded  Necromancer
Mar
7
answered Question on generating power series for a function
Mar
7
revised Question on generating power series for a function
Corrected typo in last equality
Mar
5
reviewed Approve suggested edit on If $(x^y)^z = x^{y\cdot z}$, why does $(-5)^{2^{0.5}}$not equal $(-5)^1$?
Mar
4
awarded  Yearling
Feb
12
accepted Can this quick way of showing that $K[X,Y]/(Y-X^2)\cong K[X]$ be turned into a valid argument?
Feb
10
awarded  Self-Learner
Feb
6
accepted What is the proof of the single factor theorem over an arbitrary commutative ring?
Feb
5
revised Can this quick way of showing that $K[X,Y]/(Y-X^2)\cong K[X]$ be turned into a valid argument?
added 371 characters in body
Feb
5
revised Can this quick way of showing that $K[X,Y]/(Y-X^2)\cong K[X]$ be turned into a valid argument?
added 371 characters in body