## What is the difference between partial and total derivative?

7 Answers. The key difference is that when you take a partial derivative, you operate under a sort of assumption that you hold one variable fixed while the other changes. When computing a total derivative, you allow changes in one variable to affect the other.

**What does this symbol mean ∂?**

The character ∂ (Unicode: U+2202) is a stylized cursive d mainly used as a mathematical symbol, usually to denote a partial derivative such as. (read as “the partial derivative of z with respect to x”).

### How do you calculate partial differentiation?

Example 1

- Let f(x,y)=y3x2. Calculate ∂f∂x(x,y).
- Solution: To calculate ∂f∂x(x,y), we simply view y as being a fixed number and calculate the ordinary derivative with respect to x.
- For the same f, calculate ∂f∂y(x,y).
- For the same f, calculate ∂f∂x(1,2).

**Is clairaut’s theorem always true?**

Technically, the symmetry of second derivatives is not always true. There is a theorem, referred to variously as Schwarz’s theorem or Clairaut’s theorem, which states that symmetry of second derivatives will always hold at a point if the second partial derivatives are continuous around that point.

## What is a level curve in calculus?

Level curves A level curve is simply a cross section of the graph of z=f(x,y) taken at a constant value, say z=c. A function has many level curves, as one obtains a different level curve for each value of c in the range of f(x,y).

**What comes first question mark or exclamation?**

Quotation Marks with Question Marks and Exclamation Points. If a question or exclamation is quoted directly, the quotation contains the question mark or exclamation point. If the question or exclamation is at the end of the quotation, the question mark or exclamation point comes before the closing quotation mark.

### What does the D mean in physics?

δ d = diameter. d = distance. D = distance from screen to fringe pattern.

**What is δ in math?**

The lowercase letter δ (or 𝛿) can be used to denote: A change in the value of a variable in calculus. A Functional derivative in Functional calculus. An auxiliary function in calculus, used to rigorously define the limit or continuity of a given function. The Kronecker delta in mathematics.