Include an introduction and a conclusion no matter which method you choose to structure the body of your essay. It is often helpful to write the introduction and conclusion after you have written the body of your paper. A good introduction will introduce your subject in a general fashion and then begin to narrow gradually, ending with your argument. Think of it as a map of the rest of your essay. The conclusion should return to the ideas with which you began your essay and restate your argument. It should leave your reader with a summary of your main points as well as your argument.
Often in physics and mathematics, it is useful to think of a point as having non-zero mass or charge (this is especially common in classical electromagnetism , where electrons are idealized as points with non-zero charge). The Dirac delta function , or δ function , is (informally) a generalized function on the real number line that is zero everywhere except at zero, with an integral of one over the entire real line.    The delta function is sometimes thought of as an infinitely high, infinitely thin spike at the origin, with total area one under the spike, and physically represents an idealized point mass or point charge .  It was introduced by theoretical physicist Paul Dirac . In the context of signal processing it is often referred to as the unit impulse symbol (or function).  Its discrete analog is the Kronecker delta function which is usually defined on a finite domain and takes values 0 and 1.
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