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seen Apr 12 at 17:59

Feb
4
revised Is time fundamentally different from space?
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Feb
4
revised Is time fundamentally different from space?
added 1221 characters in body; edited title
Feb
4
revised Is time fundamentally different from space?
added 13 characters in body
Jan
2
revised What is wrong in this representation of relative reference systems?
edited title
Nov
28
revised Formation of black holes
edited body