for

part of

discrepancy

and

Partial derivative) introduced the concept of partial derivative in the works of Newton, Leibniz and others, but there is no unified special symbol. 1755, used by Euler.

express

about

This symbol has a wide range of applications, but when it has a power exponent, it is no different from the general derivative, such as

this means

The square at rest means

What about the square of? Euler was then used again in 1776.

Right of expression

about

Partial derivatives of order. 1770 years, respectively, used by gaspard monge.

and

Show to the right

and

Partial derivative of; Used in condorcet 1770.

express

about

Partial differential, using

express

correct

Partial derivative of. Another place, he also used it.

Represents the total differential sum.

Represents partial differential. The most notable is Lagrange's work, which is used in 1786.

The partial derivative is pronounced as rounded, and he uses

express

correct

This is a modern symbol of partial derivative, but this symbol was not used immediately, until Youbi emphasized this symbol again in 184 1 and introduced d to represent total differential.

Represents partial differential. suppose

be

and

Function of total differential.

This symbol will be widely used in the future.