?

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The character ? (HTML element: ∂ or ∂, Unicode: U+2202) or ${\displaystyle \partial }$ is a stylized d mainly used as a mathematical symbol to denote a partial derivative such as ${\displaystyle {\frac {\partial z}{\partial x}}}$ (read as "the partial derivative of z with respect to x").

Video ?

Overview

The symbol was originally introduced by Adrien-Marie Legendre in 1786, but gained popularity when it was used by Carl Gustav Jacob Jacobi in 1841.

? is also used to denote the following:

• The Jacobian ${\displaystyle {\frac {\partial (x,y,z)}{\partial (u,v,w)}}}$.
• The boundary of a set in topology.
• The boundary operator on a chain complex in homological algebra.
• The boundary operator of a differential graded algebra.
• The Dolbeault operator on complex differential forms.

The symbol is referred to as "del" (not to be confused with ?, also known as "del"), "dee", "partial dee", "partial" (especially in LaTeX), "round d", "curly dee", or "dabba".

The lowercase Cyrillic De looks similar when italicized.

Maps ?

See also

• Delta (letter)
• List of mathematical symbols

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References

Source of the article : Wikipedia