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I vaguely remember the following conversation from back when I was a PhD student.

Student A: What’s a Bessel function?

Student B (waving his arms about): It’s a wavy thing – goes like this, doesn’t it?

Me: Sounds vaguely familiar – I think we did it in third-year.

Student A: But what IS it?

Me: Something to do with waves on a membrane, isn’t it?

Student A: Does it have a formula?

Me and student B: Don’t know…