The Spanish notation makes the parentheses around n-k obsolete, clearly saving one symbol in some formulas is worth introducing a new one in others.

The image is a cropped xkcd with the text replaced but the same joke.

Yours is one louder

Like mathematicians and physicists.

What about train station graffiti? Or Wikipedia discussion pages? Or the linux mailing list?

You have really opened a can of worms we here.

Prolog is not suitable for any problem domain, although this is more readily apparent for some domains than others.

For real, for real.