homotopy-io / homotopy-rs

A Rust/WASM implementation of homotopy.io
https://homotopy.io
BSD 3-Clause "New" or "Revised" License
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Differences between framed vs oriented #616

Open calintat opened 1 year ago

calintat commented 1 year ago

Reidemeister I move (wire needs to be oriented and invertible):

homotopy_io_export homotopy_io_export(1)

calintat commented 1 year ago

Every monoid in a braided monoidal category is commutative (both the wire and monoid need to be oriented):

homotopy_io_export(2) homotopy_io_export(3)

Similarly, given any 3-cell, you can swap any of its inputs/outputs (everything needs to be oriented):

homotopy_io_export(6) homotopy_io_export(7)

calintat commented 1 year ago

Any invertible monoid gives rise to a Frobenius-like structure (monoid needs to be oriented, wire may be framed):

homotopy_io_export(4) homotopy_io_export(5)

NickHu commented 1 year ago

Any invertible monoid gives rise to a Frobenius-like structure (monoid needs to be oriented, wire may be framed):

homotopy_io_export(4) homotopy_io_export(5)

In what sense is this Frobenius? The connectivity between the two wires has been lost

calintat commented 1 year ago

Any invertible monoid gives rise to a Frobenius-like structure (monoid needs to be oriented, wire may be framed): homotopy_io_export(4) homotopy_io_export(5)

In what sense is this Frobenius? The connectivity between the two wires has been lost

Yeah I probably shouldn't have called it Frobenius, though it's like a degenerate Frobenious law.

calintat commented 1 year ago

Here is another interesting one...

Given an oriented 2-cell on a (framed) invertible 1-cell, its trace contracts to a scalar version of the 2-cell. homotopy_io_export homotopy_io_export(1)

doctorn commented 1 year ago

Here is another interesting one...

Given an oriented 2-cell on a (framed) invertible 1-cell, its trace contracts to a scalar version of the 2-cell. homotopy_io_export homotopy_io_export(1)

This is a special case of the contractibility of disks right?

doctorn commented 1 year ago

Fun!

Contract

jamievicary commented 1 year ago

Thanks for these great points on this thread. Manuel and I had a long discussion about it. Let's all talk together when you guys are back from FLOC.