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For questions requesting examples of a certain structure or phenomenon

-3 votes

Jokes in the sense of Littlewood: examples?

The journal of unpublishable mathematics, which seems to be down at the moment is one of my favourites
1 vote

Best online mathematics videos?

All the talks of Atiyah 80+
2 votes

Best online mathematics videos?

David Cox's lectures in toric varieties at MSRI Something really good to end the evening with :)
3 votes
4 answers
1k views

Examples of divisors on an analytical manifold

In particular I would like to see examples of linear systems of divisors and how given a linear system of dimension $n$ I can choose a pencil inside it. …
Jesus Martinez Garcia's user avatar
4 votes
1 answer
3k views

Ringed and locally ringed spaces

A pair $(X,O_X)$ is a ringed space if $X$ is a topological space and $O_X$ is a sheaf of rings. If every stalk $O_{X,x}$ is a local ring, then we say that $(X,O_X)$ is a locally ringed space. In the …
Jesus Martinez Garcia's user avatar