The informal name for the classical **Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables**. As it predates Tcl by about a quarter of a century, there is no direct Tcl connection (though there is the NIST connection), but being a classical reference, it gets mentioned every now and then when something numerical is done on this wiki. Hence some pointers for those who do not themselves own a copy may be useful.

The original book can be viewed online at [2 ]. See also the Wikipedia article [1 ].

The successor to this book is the *Digital Library of Mathematical Functions* [3 ] of BIG SCIENCE: National Institute of Standards and Technology, but that is currently (2008) rather far from complete.