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You make a good point Alex
If we assume that the Universe is extremely large - well beyond the detection limits we are capable of today - then we may observe a near flat Universe even though the Universe could have any shape or curvature imaginable.
If the Universe is indeed infinite in size, wouldn't that imply that any measurement of its curvature would be flat, irrespective of its actual shape or geometry (if shape and geometry can be applied to a truly infinite object)
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