1 The water-soluble vitamins (B vitamins and vitamin C) are absorbed easily along with the water in the small intestine, where they then travel through the body via the blood vessels. 2  Fat-soluble vitamins (vitamins A, D, and K) are absorbed just like the fat mentioned above.
A function f is said to be continuously differentiable if the derivative f'(x) exists and is itself a continuous function. Though the derivative of a differentiable function never has a jump discontinuity, it is possible for the derivative to have an essential discontinuity. For example, the function.
Definition of variable. 1  1a : able or apt to vary : subject to variation or changes variable winds variable costsb : fickle, inconstant. 2  2 : characterized by variations. 3  3 : having the characteristics of a variable. 4  4 : not true to type : aberrant âused of a biological group or character.