Is the word formulæ, written with an æ at the end, valid in English? I stumbled upon this apparently plural form of formula in the Wiktionary. I had no idea the letter æ could occur in English. Does ...
I was just seeing the CV of Dr. Donald Knuth, which he calls as his Curriculum Vitæ. So is Curriculum Vitæ more appropriate than the commonly used Curriculum Vitae?