### 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.

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# Monthly Archives: April 2008

## Next Topic and Hiatus

Ok, so with the overwhelming majority of one vote, the next thing I talk about will be algebraic surfaces and intersection theory. However, first I need to do a bit of reading on this topic, as well as finishing up … Continue reading

Posted in Uncategorized
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## Ok, now I’m annoyed

I’ve generally been well-behaved about focusing on the math on this blog rather than going off into politics or whatever, but sometime while I was at my office today, someone went around campus and put up posters for Ben Stein’s … Continue reading

Posted in Uncategorized
5 Comments

## Linear Systems

Ok, so last time, we discussed divisors. We’re going to keep going in that direction now, and now we’re going to talk about linear systems of divisors. Whenever we talk about linear systems, we’ll assume that our variety is nonsingular, … Continue reading

Posted in AG From the Beginning, Algebraic Geometry
7 Comments

## Weil Divisors, Cartier Divisors and more Line Bundles.

Some people might say that the natural place for this topic is before talk of differential forms and of the canonical bundle, but I disagree. Well, really it’s fine either way, but this is my blog, so I’m going to … Continue reading

Posted in AG From the Beginning, Algebraic Geometry
8 Comments

## Differential Forms and the Canonical Bundle

We’re going to need to start out the day with a bit of algebra, because we’re going to talk about differential forms. Once we have forms, we’ll make a sheaf out of them, and then we’ll use this sheaf to … Continue reading

Posted in AG From the Beginning, Algebraic Geometry
15 Comments

## Line Bundles and the Picard Group

We’ve now talked about vector bundles and locally free sheaves, we’re going to specify to the nicest case: rank 1. We’re generally going to ignore the distinction between the sheaf and the line bundle.

Posted in AG From the Beginning, Algebraic Geometry
13 Comments

## Locally Free Sheaves and Vector Bundles

Last time, we talked about sheaves of modules, and focused on the correspondence between sheaves of ideals and subvarieties. We were talking about the internal geometry of the variety. Today, we’ll talk a bit about more external geometry. Specifically, we’ll … Continue reading

Posted in AG From the Beginning, Algebraic Geometry
9 Comments

## Themes

I’ve decided to start experimenting with wordpress’s themes in order to get a different look from the other math blogs. What do people think of this one? There’s a few others that I’ve been considering as well, and I may … Continue reading

Posted in Uncategorized
14 Comments

## Sheaves of Modules

So now that we have abstract varieties on hand, we’re going to do a bit more with sheaves, leading to some of the intimate connections between sheaf theory and geometry. Sadly, this often gives students a lot of trouble (I … Continue reading

Posted in AG From the Beginning, Algebraic Geometry
19 Comments

## Important Petition

Now, I highly doubt that I have any readers that don’t read Terry Tao’s blog, but regardless, please sign his petition (here). We need to fight threats to math education everywhere, and this is a big one. I’m behind Terry … Continue reading

Posted in Uncategorized
2 Comments