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 Feb 19 awarded Notable Question Jun 4 awarded Popular Question Mar 15 awarded Scholar Mar 15 accepted Angle between two coordinates(latitude, longitude) from a position on earth Mar 15 comment Angle between two coordinates(latitude, longitude) from a position on earth Thanks for the answer Ross. Does the ϕ and λ represents latitude, longitude respectively ? Mar 15 asked Angle between two coordinates(latitude, longitude) from a position on earth Sep 25 awarded Student Aug 26 comment A way to identify a unique number '$a_1$' has performed operations on '$x$' I think you misunderstood my question. Ok lets suppose x = 1, a1 = 2, a2= 3, a3 = 5 etc i.e. all prime numbers. And the operation is multiplication i.e. x * a1 = 2 = y1. And y1 * a2 = 6 = y2. Now from y2, I can see that a1, a2 had performed the multiplication operation on it by dividing y2 with the given number and if the result is a whole number its a proof that y2 was resulted from the operation on x by that number. So, I dont need to have a set of operations. I just need one operation that can help me create this scenario to identify whether y is related to a. Aug 26 comment A way to identify a unique number '$a_1$' has performed operations on '$x$' Any operations can be done. division, multiplication, complex, hashcode anything as long as the result again leads to a unique number. Aug 26 comment A way to identify a unique number '$a_1$' has performed operations on '$x$' I can pick x. a1, a2 etc are provided. We can do some transformation on a1, a2 as well like converting them to complex numbers if needed. Aug 26 asked A way to identify a unique number '$a_1$' has performed operations on '$x$'