@JordiGH That looks less practical than the Star Trek beaker mugs.
@Jo They worked so hard to see if they could increase their topological genus that they never stopped to think if they should.
@JordiGH oh it's a multiple torus
@sl2c Genus 2! Looks like a donut but it's not one!
@JordiGH wasn't sure if it was genus 2 or 3 since the donut opened in a weird way
@sl2c Classification theorem of 2-dimensional orientable surfaces says everything is a sphere with handles, so if you just count whatever looks like a handle, you have the genus:
@sl2c Well, for closed surfaces, if we look at the rim of the cup as not really being a boundary.
@JordiGH yeah it's just easy to miscount if you're unsure about inside/outside like I was
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