# Unappreciative

Some things I appreciate but which I used to not appreciate: The Bernstein center, $\infty$-categories, etale cohomology, L-packets, perverse sheaves.

Some things I still don’t appreciate: Monads, endoscopy, rigid cohomology, A-packets, Springer theory.

## 3 thoughts on “Unappreciative”

1. I like this post. Although I can’t agree with you on A-packets. They turn out to be super helpful in telling when Eisenstein series (or really, CAP representations) appear in cuspidal cohomology, and this is moreover helpful for p-adically deforming them. That’s why I appreciate them at least.

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2. JT says:

Saying you appreciate L-packets but not endoscopy is like saying you appreciate mashed potato but not butter.

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1. Fair enough. Maybe I’m vegan in these matters. To be clear, I do hope to appreciate all these things some day.

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