Claudio, the idea of making summation and product a bit lighter is an interesting one. Have you considered to also give the radix a similar contrast (and perhaps a descending stretch)?
I would try out to give the horizontal part of your Delta a little more thickness.
For some reason I see the Radix as in line with basic operators, but despite being very grateful for your help, I might even decide to leave Product and Summation out altogether. I drew the Delta, Pi and Sigma just to figure out how to treat their math counterparts: as of now I have no intention to extend De Vinne beyond its original Latin character set.
I would try out to give the horizontal part of your Delta a little more thickness.
And yes, you’re probably right. I looked at Takis Katsoulidis’ Apollonia: since he’s not just a native designer, but has been a teacher as well, I trusted his modulation logic.
Also, please note that I have used numerators ('num') and not superscipt numerals which I have to design yet: these are old style as the original De Vinne fractions used them this way. It was just to see the effect.
Cristobal Henestrosa said:I draw product and summation with the bottom part below the baseline (but not as much as a true descender), but frankly I am not sure if this is a good choice and why.
Cristobal, the reason for which they almost always extend to the descender value is that in general they are centered with the x-height, and looking at mathematical expressions it seems they need to be large to stand out. That’s why I think they are not so useful in De Vinne, but I might include them for full "Opentype Standard" and "MacOS Roman" (et al.) encodings coverage.
Comments
For some reason I see the Radix as in line with basic operators, but despite being very grateful for your help, I might even decide to leave Product and Summation out altogether.
I drew the Delta, Pi and Sigma just to figure out how to treat their math counterparts: as of now I have no intention to extend De Vinne beyond its original Latin character set.
Three discarded versions.