3,827 reputation
1920
bio website
location London, United Kingdom
age 26
visits member for 3 years, 4 months
seen Dec 15 at 16:26

My name is Andrea Petracci and I'm a PhD student in algebraic geometry.


Nov
30
awarded  commutative-algebra
Sep
10
awarded  Nice Question
Aug
7
awarded  Yearling
Jul
10
awarded  Enlightened
Jul
10
awarded  Nice Answer
Jul
2
awarded  Curious
May
15
awarded  Nice Answer
Mar
11
awarded  Nice Answer
Mar
5
comment An easy question with integer numbers
Thank you, Barto!
Mar
5
comment An easy question with integer numbers
Thank you very much, Ewan!
Mar
5
accepted An easy question with integer numbers
Mar
5
asked An easy question with integer numbers
Feb
11
awarded  Necromancer
Oct
27
comment When quotient map is open?
If $\pi \colon X \to X/G$ is the projection under the action of $G$ and $U \subseteq X$, then $\pi^{-1} (\pi (U)) = \cup_{g \in G} g(U)$.
Aug
7
awarded  Yearling
Jul
15
answered How to calculate the embedding dimension of this ring
Jul
10
revised Local rank and direct sum decomposition
edited body
Jul
8
answered Local rank and direct sum decomposition
Jul
8
answered Equivalence/Similarity of matrices over domains
Jul
1
comment Infinitely many primary decompositions of an ideal
See Exercise 1 of the chapter about Artin rings in Atiyah-MacDonald.