Question
is the set of all positive integers closed under addition?
if yes..give 2 examples
if no,,,give 2 examples that prove it is not
if yes..give 2 examples
if no,,,give 2 examples that prove it is not
Answers
Scott
adding positive integers results in a positive integer
... this is the definition of a closed set
pick any examples that you like
... this is the definition of a closed set
pick any examples that you like