Kanekalon hair is the straightest type of hair to use for Senegalese twists. This is probably the most popular type of hair to use for this particular style. People love it because itâs l ight and soft.
Definition LT. Linear Transformation. A linear transformation, T : U â V , is a function that carries elements of the vector space U (called the domain) to the vector space V (called the codomain), and which has two additional properties.
If its second derivative is positive at all points then the function is strictly convex, but the converse does not hold. For example, the second derivative of f (x) = x 4 is f â²â²(x) = 12 x 2, which is zero for x = 0, but x 4 is strictly convex. Every real-valued linear transformation is convex but not strictly convex, since if f is linear, then This statement also holds if we replace convex by concave. 2  Every real-valued affine function, i.e., each function of the form, is simultaneously convex and concave.