### 87.2 Package absimp

The `absimp` package contains pattern-matching rules that extend the built-in simplification rules for the `abs` and `signum` functions. `absimp` respects relations established with the built-in `assume` function and by declarations such as `mode_declare (m, even, n, odd)` for even or odd integers.

`absimp` defines `unitramp` and `unitstep` functions in terms of `abs` and `signum`.

`load ("absimp")` loads this package. `demo ("absimp")` shows a demonstration of this package.

Examples:

    (%i1) load ("absimp")$

    (%i2) (abs (x))^2;
                                    2
    (%o2)                          x

    (%i3) diff (abs (x), x);
                                   x
    (%o3)                        ------
                                 abs(x)

    (%i4) cosh (abs (x));
    (%o4)                        cosh(x)

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