Or so they say.

I have known two mathematicians well, one was my teacher - who often
said that infinity was not a number, it was a place - but who hit his
wife over the head with a frying pan and killed her.

The other was a university friend who got annoyed one day when he
couldn't open his door and punched it, breaking his hand in many places
and taking the door, frame and all, down.

I digress. I write to ask, what is the ?Greek? letter which looks like a
small p or Greek rho with the stem extended upwards? You see it on
blackboards mostly.

Thanks

Peter Fairbrother

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James Waldby <[email protected]> wrote:

Peter Fairbrother <[email protected]> wrote:

Or so they say.

[snip]

I digress. I write to ask, what is the ?Greek? letter which looks like a
small p or Greek rho with the stem extended upwards? You see it on
blackboards mostly.

I'm not recognizing that description as among Greek letters ... is it
in charts at either of the following? <https://en.wikipedia.org/wiki/Greek_alphabet> <https://en.wikipedia.org/wiki/Greek_script_in_Unicode>

However I'm reminded of thorn (without stroke), as seen at eg <https://en.wikipedia.org/wiki/Thorn_(letter)>

At the end of the Greek_script link, there's a character looking like
thorn. See "Greek Capital Letter Sho" or san pages <https://en.wikipedia.org/wiki/Sho_(letter)> and <https://www.compart.com/en/unicode/U+03F7>

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Peter Fairbrother <[email protected]> wrote:

Or so they say.

[snip]

I digress. I write to ask, what is the ?Greek? letter which looks like a small p or Greek rho with the stem extended upwards? You see it on blackboards mostly.

I'm not recognizing that description as among Greek letters ... is it
in charts at either of the following? <https://en.wikipedia.org/wiki/Greek_alphabet> <https://en.wikipedia.org/wiki/Greek_script_in_Unicode>

However I'm reminded of thorn (without stroke), as seen at eg <https://en.wikipedia.org/wiki/Thorn_(letter)>

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Am 16.01.2025 um 02:44 schrieb Peter Fairbrother:

[...] I write to ask, what is the ?Greek? letter which looks like a
small p or Greek rho with the stem extended upwards? You see it on blackboards mostly.

A "d"?

Like in "dx/dy"?

Or maybe a related, symbol: https://de.wikipedia.org/wiki/%E2%88%82

∂

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