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tiny-tim, the "Learning LaTeX" link in your signature could use an update.
Enhancing the PF Posting Frame with Additional Useful Symbols?
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Fredrik said:
looks ok to me
…and the https://www.physicsforums.com/showthread.php?t=386951 sticky 
actually, with the new box, i hardly ever use my signature
btw, is the box invisible on some devices (eg phones)?
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You're linking to the old sticky (which is no longer a sticky), but at least it contains a link to the new one. I just thought that you might want to link directly to the new one, but you can of course link to whatever you want to.tiny-tim said:looks ok to me
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Fredrik said:
two links are still a link!
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Fredrik said:∅ is the empty set.
I agree that φ would be useful (occasionally).
here's a typical thread where ∅ looks horrible …
physics kiddy said:
(i've taken to typing ψ instead of ∅
)can we please have φ ?
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Well, yes, but that's like saying that the word "fo∅l" looks weird when one of the o's is replaced by the empty set symbol. It's not a phi, and to try to use it as a phi is quite bizarre.
φ is one of the more useful greek letters, so I wouldn't mind having it added to the list. It's not as useful as · though.
Do people really use ∴and ∠ ?
φ is one of the more useful greek letters, so I wouldn't mind having it added to the list. It's not as useful as · though.
Do people really use ∴and ∠ ?