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.
1 Remember, more is not better. 2  Use the application rate on the label. 3  Some herbicides are selective, and only kill certain types of plants, while others are non-selective and kill almost any type of plant. 4  Some herbicides kill weeds quickly, others can take up to a week or more. Some herbicides kill weeds quickly, others can take up to a week or more. 2  Some herbicides persist in plants and soils for long periods of time, while others only remain in plants or soil for a short time.