### About this blog

Rigorous trivialities is a web log about mathematics, but especially geometry, broadly construed. Contributors will be Charles Siegel, Jim Stankewicz and occasionally Matt Deland. Charles specializes in algebraic geometry, topology and mathematical physics. Jim specializes in arithmetic algebraic geometry. Matt has transitioned from algebraic geometry to work in industry.

Header is taken from the larger work by fdecomite under the creative commons license.

### Categories

- Abelian Varieties AG From the Beginning Algebraic Geometry Algebraic Topology Big Theorems Cohomology Combinatorics Complex Analysis Computational Methods Conferences Cranks Curves Deformation Theory Differential Geometry Enumerative Geometry Examples Group Theory Hilbert Scheme Hodge Theory ICTP Summer School Intersection Theory Knot Theory MaBloWriMo Math Culture Mathematical Physics Moduli of Curves Talks Toric Geometry Uncategorized Vector Bundles
### Recent Comments

Charles Siegel on I know I’ve said it befo… Anonymous on I know I’ve said it befo… isomorphismes on Sheaves Charles Siegel on Sheaves isomorphismes on Sheaves ### Links

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### Top Posts & Pages

- New Series: Moduli of Riemann Surfaces
- I know I've said it before, but...
- AG from the Beginning
- The Veronese Embedding
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- The Chow Ring and Chern Classes
- Locally Free Sheaves and Vector Bundles
- Representable Functors
- The torsion on CM elliptic curves over prime degree number fields
- A new crank! And a call for examples

# Monthly Archives: September 2007

## deGroot’s Problem

Recently, a lot of blogs (incited by the Everything Seminar) have been talking about the Axiom of Choice and it’s more horrifying implications. Well, I’m going to jump in on the bandwagon and present deGroot’s problem. This is essentially a … Continue reading

Posted in Group Theory, Logic
3 Comments

## More Introductions

Hi, I’m Joe, and I’m a second-year graduate student at Stony Brook University. I’ve just passed the comprehesive exams (qualifying exams at most other schools) at the beginning of the semester and will soon start preparing for orals. I’ve known … Continue reading

Posted in Uncategorized
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## Sheaves on Sites

In this post, I defined Grothendieck Topologies and gave some examples. Look there and in related links for more on Grothendieck topologies. We’re going to move on to Sheaves today. This is going to be a minipost, because this does … Continue reading

Posted in Algebraic Geometry
2 Comments

## Introducing myself

I should probably introduce myself (and start writing as well!). I’m Matt, a first-year grad student at the University of Chicago. I’m interested in algebra, geometry, and topology, but I also find various topics in theoretical CS and in logic … Continue reading

Posted in Uncategorized
1 Comment

## Grothendieck Topologies

Topology. It’s something that every math student has to become comfortable with. First you get to learn metric topology (usually on ), followed by point set topology. Then in graduate school, pretty much everyone gets an introduction to algebraic topology. … Continue reading

Posted in Algebraic Geometry
12 Comments

## Algebraic Geometry – A Historical Sketch I

So, I WAS going to give a classical proof of a classical algebraic geometry theorem: that there are exactly twenty-seven lines on any smooth cubic surface. I wanted to avoid using the machinery of divisors and all the attached technicality, … Continue reading

Posted in Algebraic Geometry
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## Group Theory and Physics

I’m posting late yet again. I seem to be making a habit of it, hopefully I’ll pull myself together eventually, but I’m going to back off on my goal of a weekly post for a bit. For now, I’m going … Continue reading

Posted in Group Theory, Mathematical Physics
4 Comments