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Ruslan
Ruslan
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It's the magnitude of the gradient of $F$.

$grad F$$\operatorname{grad} F$ or $\nabla F$ denotes the gradient of the field F and thus |grad F|$|\operatorname{grad} F|$ is the magnitude of the gradient of F.

It's common practise, but just a matter of taste, to use $grad F$$\operatorname{grad} F$ over $\nabla F$ in order to guide the eye easier as to what is being done or used (similar to $curl A = \nabla \times A$$\operatorname{curl} A = \nabla \times A$).

It's the magnitude of the gradient of $F$.

$grad F$ or $\nabla F$ denotes the gradient of the field F and thus |grad F| is the magnitude of the gradient of F.

It's common practise, but just a matter of taste, to use $grad F$ over $\nabla F$ in order to guide the eye easier as to what is being done or used (similar to $curl A = \nabla \times A$).

It's the magnitude of the gradient of $F$.

$\operatorname{grad} F$ or $\nabla F$ denotes the gradient of the field F and thus $|\operatorname{grad} F|$ is the magnitude of the gradient of F.

It's common practise, but just a matter of taste, to use $\operatorname{grad} F$ over $\nabla F$ in order to guide the eye easier as to what is being done or used (similar to $\operatorname{curl} A = \nabla \times A$).

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planetmaker
planetmaker
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It's the magnitude of the gradient of $F$.

$grad F$ or $\nabla F$ denotes the gradient of the field F and thus |grad F| is the magnitude of the gradient of F.

It's common practise, but just a matter of taste, to use $grad F$ over $\nabla F$ in order to guide the eye easier as to what is being done or used (similar to $curl A = \nabla \times A$).