1 1/x has oscillation â at x = 0, and oscillation 0 at other finite x and at ââ and 2  +â. sin (1/x) (the topologist's sine curve) has oscillation 2 at x = 0, and 0 elsewhere. 3  sin x has oscillation 0 at every finite x, and 2 at ââ and  +â. The sequence 1, â1, 1, â1, 1, â1, ... has oscillation 2.
An herbicide is a chemical used to kill or inhibit the growth of weeds and other unwanted plant pests. There are two kinds of herbicides. Species-specific herbicides are designed to kill a specific kind of plant only, leaving other desirable plants unharmed.hen should you use an herbicide? An herbicide is appropriate any time that you have pest plants or weeds that are competing with desired plants or crops for space, water, light, and nutrients. They are often used in lawn and garden care to achieve a desired aesthetic effect.
A spermicide is any compound that can be used to kill sperm. Spermicides are used in many contraceptives, These products come in several forms. Contraceptive foams, creams, suppositories, and films all contain spermicides. Furthermore, spermicides are needed for diaphragms and cervical caps to be effective. Many spermicides currently available in the United States contain nonoxynol-9 (N-9). N-9 is also the spermicide in the Today sponge. Other spermicides, and spermicidal microbicides, are currently under development. Many are designed to avoid the problems currently being seen with N-9 use.