This might be a silly question, but I have no clue what it means:
it's from this question i'm working on:
I'm taking a CS course, and all the math i've done is calculus and linear algebra. I've never see approximation squiggly lines with a subscript. What on earth? I wish schools prepared us more properly, before throwing us the wolves. Half the time I'm spending trying to decipher what any of this means mathematically.