I`ve been studying the mathematics of relativity theory and came across this one:
All I really want to know is what the name of this formula is. Does it have a name?

I`ve been studying the mathematics of relativity theory and came across this one:
All I really want to know is what the name of this formula is. Does it have a name?
Would you have a reference for where you saw this expression ?
The letter is usually used for proper time in the context of relativity, however, I have never before seen braket notation being used in a proper time path integral. I can't really make much sense of it unless I see in which context it is used.
I got this formula from here:
What are the formula of relativity theory  Science Forums
Essentially, I asked a question similar to this one on another science forum, but when it came to asking about the actual name of this formula, I got no replies.
Ok, thanks for the link, it is clear now. Just as I suspected this is the formula for proper time, just written in a somewhat unusual manner. In standard textbooks it usually appears as
See also here for further information :
Proper time  Wikipedia, the free encyclopedia
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