Timeline for What does the notation $|\text{grad} \ F|$ mean?
Current License: CC BY-SA 4.0
14 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jul 17, 2020 at 5:08 | answer | added | BIKASH KUMAR DAS | timeline score: 0 | |
| Jul 14, 2020 at 21:17 | comment | added | The Pointer | @G.Smith $\hat{\rho}$ is surface charge density and $\hat{\mathbf{j}}$ is surface current density. As mentioned in the comment by Jerrold Franklin to planetmaker's answer, this textbook was written before hats were used to denote unit vectors. | |
| Jul 14, 2020 at 16:43 | comment | added | G. Smith | What do the hats mean? For example what is $\hat\rho$? | |
| Jul 14, 2020 at 10:48 | vote | accept | The Pointer | ||
| Jul 14, 2020 at 10:48 | answer | added | planetmaker | timeline score: 1 | |
| Jul 14, 2020 at 10:43 | comment | added | The Pointer | @planetmaker I just studied bra-ket notation $\langle \mid \rangle$, so maybe that is why my brain thought it was something else. | |
| Jul 14, 2020 at 10:42 | comment | added | planetmaker | It looks totally normal and is very common notation.Only nit-pick is that I'd expect the magnitude bars closer to it's vector and not evenly spaced between the constituents of the equation. $\rho = \hat{\rho} |grad{F}| \delta(F)$ | |
| Jul 14, 2020 at 10:22 | review | Suggested edits | |||
| Jul 14, 2020 at 10:28 | |||||
| Jul 14, 2020 at 10:20 | review | Suggested edits | |||
| Jul 14, 2020 at 10:21 | |||||
| Jul 14, 2020 at 10:18 | comment | added | The Pointer | @BySymmetry Ok, thanks. The form that (17a) and (18a) are written in almost makes it look like some new notation, rather than the magnitude. | |
| Jul 14, 2020 at 10:17 | comment | added | By Symmetry | To add to @planetmaker's comment, an alternative notation would be $|\vec{\nabla} F|$ | |
| Jul 14, 2020 at 10:15 | comment | added | The Pointer | @planetmaker Oh, so 17a just means $\hat{\rho}$ times the magnitude of $\text{grad} \ F$ times $\delta(F)$? | |
| Jul 14, 2020 at 10:12 | comment | added | planetmaker | $grad F$ is a vector (the gradient of F) and |grad F| is the magnitude of that vector. | |
| Jul 14, 2020 at 10:09 | history | asked | The Pointer | CC BY-SA 4.0 |