What is imaginary time?
93652
The meaning of imaginary time
56745
Why does this not work with an imaginary exponent?
69115
Imaginary line on the Earth is straight or not?
60934
What is a complex inner product space "really"?
43724
What do spacelike, timelike and lightlike spacetime interval really mean?
111371
What really is Spacetime?
29426
Is there a proof of existence of time?
46144
Understanding imaginary exponents
76670
Are We Living in a Simulated Universe?
148644
Definition of complex number
70455
Why are all nonzero eigenvalues of the skew-symmetric real matrices pure imaginary?
106863
Special relativity and imaginary coefficient of the time coordinate
27567
What is zero times infinity?
116355
Do singularities have a "real" as opposed to mathematical or idealized existence?
43309
What exactly is infinity?
19655
Why don't we define "imaginary" numbers for every "impossibility"?
21628
What is the definition of a timelike and spacelike singularity?