# How is gateaux derivative calculated?

## How is gateaux derivative calculated?

The Gateaux differential of an elementwise product f g is dh(f g)=(dh f)g + f(dhg). The Gateaux differential of an inner product 〈f, g〉 (or f Tg) is dh 〈f, g〉 = 〈f, dhg〉 + 〈dh f, g〉 . With transpose notation, this is dh(f Tg) = f Tdhg + (dh f)Tg.

What is gateaux derivative used for?

Like the Fréchet derivative on a Banach space, the Gateaux differential is often used to formalize the functional derivative commonly used in the calculus of variations and physics. Unlike other forms of derivatives, the Gateaux differential of a function may be nonlinear.

### What is the mean value theorem for derivatives?

The Mean Value Theorem states that if a function f is continuous on the closed interval [a,b] and differentiable on the open interval (a,b), then there exists a point c in the interval (a,b) such that f'(c) is equal to the function’s average rate of change over [a,b].

Does the intermediate value theorem apply to derivatives?

The intermediate value theorem, which implies Darboux’s theorem when the derivative function is continuous, is a familiar result in calculus that states, in simplest terms, that if a continuous real-valued function f defined on the closed interval [−1, 1] satisfies f(−1) < 0 and f(1) > 0, then f(x) = 0 for at least one …

## Is frechet derivative continuous?

A function which is Fréchet differentiable at a point is continuous there, but this is not the case for Gâteaux differentiable functions (even in the finite dimensional case).

What is a partial derivative in math?

partial derivative, In differential calculus, the derivative of a function of several variables with respect to change in just one of its variables. Partial derivatives are useful in analyzing surfaces for maximum and minimum points and give rise to partial differential equations.

### What is the formula for the mean value theorem?

This is the Mean Value Theorem. If f′(x)=0 over an interval I, then f is constant over I. If two differentiable functions f and g satisfy f′(x)=g′(x) over I, then f(x)=g(x)+C for some constant C.

Does intermediate value theorem need to be differentiable?

Intermediate Value Theorem is only true with continuous, differentiable functions, thus eliminating the answer choices “The function is not continuous within that interval” and “The function is not differentiable within that interval.” There is not necessarily a local maximum or minimum contained in the interval either …

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