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**Abstract.** I will describe a general machine, a close cousin of
Taylor's theorem, whose inputs are topics in topology and whose outputs
are problems in algebra. There are many inputs the machine can take, and
many outputs it produces, but I will concentrate on just one input/output
pair. When fed with a certain class of knotted 2-dimensional objects
in 4-dimensional space, it outputs the Kashiwara-Vergne Problem (1978,
solved Alekseev-Meinrenken 2006, elucidated Alekseev-Torossian 2008-2011),
a problem about convolutions on Lie groups and Lie algebras.

**Handout:**
KVT.html,
KVT.pdf,
KVT.png.
**Talk video:** See Talks: Leiden-1601.

See the paper.

**Sources:** pensieve.