Mathematical spellcheck fail

I love my Macs, so it pains me to post this. All three of my Macs think that “Pythagoras” is a misspelling. That fact doesn’t bother meā€”there are a lot of proper nouns missing from the spellcheck dictionary. What hurts is that the spellchecker suggests Pythagorus as a correction. See screenshot below. C’mon Apple! You’re…