@Felthry second one looks like a bandaged tongue
@lioness the second one??
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@Felthry third one sorry
@lioness okay that makes more sense
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@lioness it is apparently "closed union with smash product"
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@Felthry …huh.
@lioness we have no idea what that means, you'd probably have to ask a mathematician and then it'd have to be one in a very particular subfield
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@Felthry @lioness I assume the "closed union" is literally that, the closure of the union of two spaces (in some other ambient space)
the smash product is a very basic but slightly weird construction in topology - basically, you product two spaces together and then you look at the copies of the two factor spaces sitting in the product and you slorp them down to the origin point
the smash product of two lines, for instance, is (I think) the union of four open 3-balls plus a point to tie them together
the smash product of two circles is a normal 2-sphere, if one with a *really* fucked up induced metric.
(I assume that the serifs are purely typographical, with no mathematical meaning)
@Felthry @lioness Marginally! Usually easier to deal with whole planes than quarterplanes, hilariously enough
https://mathoverflow.net/questions/53700/is-there-a-way-to-graphically-imagine-smash-product-of-two-topological-spaces
Here's a vague picture