        Mathematics was universal.  Presuming their numbering system and mathematical notation was as different as their alphabet, calculus and trigonometry were non-starters.  If he got a book of geometry, though, they’d instantly understand.  They probably didn’t use the same symbols for constants—it was hard to imagine that the symbol for pi was universal, but the concept was.  He couldn’t remember most of the math he’d learned in high school, but that didn’t matter.  Most of it would come back to him when he had a textbook in front of him, and he figured that they probably weren’t expecting him to be a mathematical prodigy, anyway.  It wasn’t like he could teach them anything they didn’t know about math.