<<< native [ EUnderover True (ESymbol Op "\8721") (EGrouped [ EIdentifier "i" , ESymbol Rel "=" , ENumber "1" ]) (ENumber "100") , EIdentifier "x" , ESymbol Rel "=" , EFraction NormalFrac (EGrouped [ ENumber "100" , ESymbol Bin "*" , ENumber "101" ]) (ENumber "2") ] >>> tex \sum_{i = 1}^{100}x = \frac{100 * 101}{2}