a very warm welcome to pgrmdave.

excuse me, what's the difference between QT and QM?
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It was my understanding that Euclidian geometry is still true within a universe with fewer dimensions
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so how can euclidian geometry be simultaneously right and wrong? It has to be either one of the two. Refering to Bo, it is a matter of application and suitability. In most situations, it is satisfactory and you don't have to be concerned too much about quantum effects and spacetime-gravity.
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There are several reasons why QT and GR are extremely hard to bring together
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so what's the solution to bring it together? GUTs?