We have the symbol ,with the interpretation
for some number ,
but there doesn’t appear to exist a symbol (Here, I use a boxed question mark: to denote the symbol I claim doesn’t exist) with the interpretation
for some number .
This pains me. People sometimes have to resort to writing something like
where the constants are (in general) different on lines (1) and (2).”
Even worse (or maybe not?), sometimes people seem to leave exponents lying around when they otherwise wouldn’t, e.g. write
We have no symbol meaning “normalized sum”. How many thousands of times have you seen some variant of
Why do we need to define ? Can’t we just use another mystery symbol to write
In some situations you could use , but that doesn’t always really work and is rarely done.