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visits member for 1 year, 9 months
seen Apr 15 at 20:42

Feb
6
comment What grounds the difference between space and time?
One important difference is that the time coordinate has order (causality), which is absent in the spatial coordinates.
Jan
13
awarded  Scholar
Jan
13
accepted equivalence of wave equations
Jan
9
comment equivalence of wave equations
@Lacek Equivalence means they have the same solution.
Jan
9
awarded  Student
Jan
9
asked equivalence of wave equations
Oct
24
awarded  Supporter