For adults, a normal resting rate is 60 to 100 beats per minute. Athletes may have a rate as low as 40 bpm because their hearts are trained to efficiently pump blood. If your heart rate is consistently below 60 or above 100, you may have a heart condition, such as arrhythmia.
Integrating Factor. An integrating factor is a function by which an ordinary differential equation can be multiplied in order to make it integrable. For example, a linear first-order ordinary differential equation of type.
Integrating factor is very useful. Here is the explanation. An integrating factor is used to eliminate the derivative of a differential equation in a shaped like this, first-order linear ordinary differential equation, and make it in normal form, an algebraic equation. Here, N(t) expresses a certain increasing quantity.