SUMS OF STRONGLY IRREDUCIBLE OPERATORS

A bicycle saddle includes a protective outer covering, a rigid inside covering disposed inside the protective outer covering, a foamed lining disposed between the protective outer covering and the rigid inside covering, a flash light disposed at a rear side outside the saddle, a control switch disposed inside the saddle, and a DC power supply unit electrically connected to the flash light through the control switch, and wherein when the rider sits on the saddle the control switch is switched on by the pressure of the rider causing the flash light to give an audio flash signal.