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An example where infinity can be seen as a limit would be in any attempt to divide by zero.  The result is an undefined value, but it can be seen with the function <math>F</math>_x = <math>1/x</math> that as x approaches the value of zero, that the resulting answer approaches infinity.

An example where infinity can be seen as a limit would be in any attempt to divide by zero.  The result is an undefined value, but it can be seen with the function <math>F</math>_x = <math>1/x</math> that as x approaches the value of zero, that the resulting answer approaches infinity.

      

      

[[Georg Cantor]]'s diagonal argument is an elegant proof demonstrating that the infinity of real numbers is greater than the infinity of countable integers.  The essence of the argument is that in any proposed list of all real numbers, a new real number not in the list can be constructed by taking the digits in a diagonal through the list and changing them to construct a new real number that differs from the nth entry at the nth position right of the decimal point.

[[Georg Cantor]]'s diagonal argument is an elegant proof demonstrating that the infinity of real numbers is greater than the infinity of countable integers.  The essence of the argument is that in any proposed list of all real numbers, a new real number not in the list can be constructed by taking the digits in a diagonal through the list and changing them to construct a new real number that differs from the nth entry at the nth position right of the decimal point. 

 

To formalize countably and uncountably infinite, we need the [[set theory]] concept of [[cardinality]].  Using set theory it can be shown that there are infinitely many distinct infinite cardinalities.

Infinity is written using the symbol &infin;  

Infinity is written using the symbol &infin;