no
http://www.ibm.com/developerworks/rational/products/rose/
yes
it has the word rational in it
The set of rational numbers includes the set of natural numbers but they are not the same. All natural numbers are rational, not all rational numbers are natural.
Req Pro was a part of the original Rational suite (Rational Rose, Rational Clear Case). DOORS Was a major competitor to Req Pro, later IBM bought it and renamed it to Rational DOORS. So now you have two requirement tools under IBM. DOORS is generally used by Systems Engineering companies and ReqPro by IT companies. Presently IBM is developing another product based on their open source intiative - jazz.net; which is called Rational Requirements Composer. RRC can be considered next generation version of ReqPro
Any rational positive number is still rational when you make the same number negative.
yes rational means repeating. same thing.
There is no infinite rational number. There are infinitely many of them but that is not the same.
Yes.
It can't be both at the same time. Irrational means "not rational".
Type your answer here... same
If it ends there, it is rational. If it continues with the same digit (2 in this case) over and over, it is also rational.