Arithmetic operations +, -, /, *, etc

[ptal]

In addition, cos, sin, log, ... and every operations described in http://www.boost.org/doc/libs/1_57_0/libs/numeric/interval/doc/interval.htm could be implemented.

[ptal]

For division, read 4.7 in http://fab.cba.mit.edu/classes/S62.12/docs/Hickey_interval.pdf