What is "integral equations"

Usage examples of "integral equations".

Now she studied--Aaron had once said that while the First had ice on their minds, Linda had integral equations on hers--worked, and nursed her baby, and the only way to see her was to come to the command center.

Now she studied-Aaron had once said that while the First had ice on their minds, Linda had integral equations on hers-worked, and nursed her baby, and the only way to see her was to come to the command center.

She closed her eyes and tried to think about Charlie, about her battered old VW, about classical Latin verb conjugations, about solving complex integral equations.