WInfinityWInfinity (philosophy)WAleph numberWApeirogonWCantor's diagonal argumentWDivision by zeroWHilbert's paradox of the Grand HotelWHyperreal numberWIdeal pointWInfinite monkey theoremWInfinitesimalWInfinity symbolWInfinity mirrorWNonstandard analysisWPoint at infinityWProjectively extended real lineWSurreal numberWJohn WallisWWhere Mathematics Comes From