Question

What comes after -infinity

Answer 1

infinity itself is a lot bigger but there are numbers greater than infinity 
like 
1+∞ =∞
but , ∞ + 1 =the number that comes after infinity...

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Answer 2

infinity is not a number , its peduo-hypothetical . You can never reach infinity .

By defination infinity : Infinity is larger than the biggest number you can imagine .

By dictionary : infinty means something that is not finite .

So you cant even reach infinity , the question what is afyer infinity is bogus.