What Letter is the Circled One? - Bob

[bobfei]

Hi,

Could anyone tell me what letter the circled one is? I thought it might be “tau” τ or “gamma” γ, but none of the two looked exactly the same as it.

Bob

 

[Nytik]

I'm not sure, though it might help to know what the symbol is meant to represent... does it correspond to $\left|\vec{r}-\vec{r'}\right|$?

 

[Dadface]

Looks like eta

 

[bobfei]

Nytik,

Yes, exactly:
This symbol represent radius from a point electric source, and is found on page 235 of Griffiths, David J. - Introduction to Electrodynamics (3ed).

Dadface,
Looks alike, but I am not sure.

Bob

 

[Borek]

Perhaps r, like in

http://en.wikipedia.org/wiki/Kuenstler_Script

No idea if this type of r has any particular name.

 

[bobfei]

Borek,

It looks very close. I would agree with it.

Bob

 

[Nytik]

That r looks like a perfect match! Now I'm wondering how Borek knew that typeface so well...

 

[Borek]

That r looks like a perfect match! Now I'm wondering how Borek knew that typeface so well...

I didn't knew typeface, I knew the letter. That was just the best link with this kind of r I could find in a few minutes.

 

[_PJ_]

The formula is reprised here where an R is used to avoid confusion with r :
http://www.jpoffline.com/physics_docs/y3s6/electrodynamics_ln.pdf

 

[rollcast]

I didn't knew typeface, I knew the letter. That was just the best link with this kind of r I could find in a few minutes.

http://en.wikipedia.org/wiki/Copperplate_script

That's the original style from which most "curly" scripts originated from.

 

[Borek]

That's the original style from which most "curly" scripts originated from.

I bet this kind of r is earlier than that and came from the cursive.