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Originally Posted by harmonygirl if one accepts the hypothesis that space is curved (I am not sure how to incorporate time), couldn't AB and CD be parallel (or have they been defined as not parallel?) |
For one, I don't think space is curved locally but it is very difficult to refute Einstein's special and general relativity even though these theories are global theories. For me, AB and CD are always parallel to each other at the local infinitesimal region of space and time.