Post #2870349
2026-04-16 12:41 UTC
Here's what it looks like, starting with a square sheet (a). First, fold it into quarters (b), then fold diagonally to put all of the boundary edges on top of each other (c). Finally, glue all of the edges together (d).
Replies (1)
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@matt_zucker@mastodon.social 2026-04-16 12:41
Now all four corners of the square are mathematically considered to be the same point, as are any set of points along a boundary edge that are all the same distance away from the corner. BTW when solving the PDEs, we don't consider the effects of the folds, just the "glue".