The_A4_Paper t1_j6miz2h wrote
Reply to comment by ZombieCupcake22 in ELI5: If the universe is flat, and therefore infinite in size, how could it have been condensed to a single point in the past? by joeyo1423
To add to this though, Not all tori are flat. Donut isn't flat it's negative on the inside and positive on the outside. When we specifically talk about tori that are flat, we usually refer to them as "flat torus"
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