Numerics.h and FPEnvironment.h. But many of the numerical facilities described here are available elsewhere with just a spelling change. By convention, the names of CommonPoint library functions and macros have initial capital letters, as in Tan, ArcCos, and IsGreater. FPCE uses the names tan, acos, and isgreater. FPCE facilities that have been available in Standard C runtime libraries have names taken from the Standard C header math.h.
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