In mathematics a quantity is said to be invariant if its value does not change following a given operation. For instance, multiplication of any real number by the identity element (1) leaves it unchanged. Thus, all real numbers are invariant under the...

In mathematics, an invariant is something that does not change under a set of transformations. The property of being an invariant is invariance. Mathematicians say that a quantity is invariant "under" a transformation; some economists say it is...

Journalism: One of the assertions that the media make most often about the U.S. economy is that President Bush's tax cuts didn't do what he promised. But the data clearly show nothing could be farther from the truth.Bush lowered taxes in both 2001 and 2003....

The head of the East Side's venerable Lexington Democratic Club, Alex Tisch, sent out an email yesterday concerning ground rules for the group's future meetings. Apparently, things are getting a little out of hand up there. The behavior of some members of the Executive Committee...

Former U.S. Federal Reserve Chairman Alan Greenspan warned Monday that the American economy might slip into recession by year's end.He said the U.S. economy has been expanding since 2001 and that there are signs the current economic cycle is coming to an end."When you get...

Climate change is partly to blame for the conflict in Sudan's Darfur region, where droughts have provoked fighting over water sources, U.N. Secretary-General Ban Ki-moon said in an editorial published Saturday."Almost invariably, we discuss Darfur in a convenient military and political shorthand _ an ethnic...