This header file provides function prototypes for the math functions conventionally found in libm, the standard C math library. Although these functions are not part of the minimal C library, an implementation of the math functions is available in the FreeBSD math library; see Chapter 14 for details. This header file also defines various floating-point constants, such as the value of, as described in the Unix CAE specification. Since these functions and their implementations are fully standard, they are not described in further detail here; refer to the ISO C and Unix standards for more information.