According to mathematics, everything has its opponent. Suppose something is $x$. Let $x = 5$, then $x^2 = 25$, and again if $x^2 = 25$, then x may be positive or negative. In the same way, let $x = time$, then is there something like $antitime$?
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1What is time, does it flow, and if so what defines its direction? – mmesser314 Jun 15 '20 at 04:18
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"According to mathematics, everything has anti nature", what? – Jun 15 '20 at 22:32
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Everything has anti nature because Everything can be written as x. X may be anything it may be mass or any other property. If x = 5. Then X^2 = 5^2 =25 then if we try to solve the equation x^2=25 we will get x=5 or x=-5. It means there is something which is -5. – Roshan kumar Jun 16 '20 at 03:49
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In the theoretical physics there is the existence of negative mass – Roshan kumar Jun 16 '20 at 04:22
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Just because something exists mathematically doesn't mean it exists physically. – BioPhysicist Jun 17 '20 at 13:09
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At least in the world of mathematical physics, there is, and here is an example.
A charged particle traveling forward in time from one point to another may be considered indistinguishable from its antiparticle counterpart (identical to it except carrying the opposite charge) traveling between those two same points, only going backwards in time.
A fairly good exposition of this is contained in Feynman's Dirac Memorial Lecture, which can be viewed on youtube or read in the book of the same name which contains it.
niels nielsen
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