Impossible to have Active Interaction With Beings Belonging To The Past(an IITian Conjecture).

If Proper Time is An Ordered Mathematical Field That Exists In Spacetime, No Closed Time Loop Can Exist In Spacetime.It is Because World Line Of The Observer Shall Be Isomorphic To Real Field R.So it is Impossible To Go The PAST To Have Active Interaction With Beings Belonging To The Past.Then Grand Father Paradox Doesn’t Exist[an IITian Conjecture].(Ref:” Mathematical Philosophy Of Time (Published On IJERT)“,this Paper Could Be Read Online On Google).{CRITICAL COMMENTS?}