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wnoise comments on The Graviton as Aether - Less Wrong
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It's common shorthand for 4 spatial dimensions, and 1 time-dimension, stressing that there is indeed a split, and that not all dimensions are equivalent. Perhaps, given the compactification of 1, it should be 3+1+1, but I've never seen that used.
Thanks, I wasn't sure whether the +1 was the time or the compact dimension.