Early 20th century diacritics

More from Frege’s Grundgestze der Arithmetik II (Jenna, Germany, 1903).
The attached are details of an inverted c and e sporting odd hook-like
diacritics. The final attachment has the e in context — raised slightly
from the baseline and a little smaller than its arguments.

Any thoughts on these hooks?

| Attachment | Size | | --- | --- | | c-spur02.jpg | 18.43 KB | | e-spur02.jpg | 13.48 KB | | 2-001-002.jpg | 29.83 KB |

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Hello Jim,

e-spuro2 shows an ’e caudata’ upside down. This glyph is an abbreviation for ae and has been used since the early middle ages.

as 2-001-002 shows, Frege seems to have used any odd shaped glyph for his equations. And he used them upside down to prevent any misinterpretation as a letter; remember the thread about the pound abbreviation.

c-spuro2 (also upside down) looks vaguely familiar to me, but I can’t find an example. It is not a c with a cedille.


Hello again Wolfgang — thanks for the reply. I initially
thought an ogonek too, but now I’m not so sure: It looks too
big, it does not curl around to the right-hand side of its
host in the same way (or left, overturned) instead it sort
of dangles. Also, the end is rather blunt.

As a indicator of nasality in vowels it certainly doesn’t
belong on a c, so I though it might be a diacritic from
somewhere else grafted onto them both.

As to “any odd shaped glyph” I can agree with the “odd”,
but Frege seem to me rather systematic in his symbolism.




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