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Chromotron t1_j6mioqq wrote on January 31, 2023 at 11:34 AM

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

Be careful, technically a torus is not flat at most points when drawn as a donut. One needs to use the "flat torus" which can only be properly embedded ("drawn") in 4 dimensions.