The discussion centers on identifying the simplest concept in mathematics, with participants debating between "set," "True-False," and basic arithmetic functions. One argument highlights that addition is fundamental, as it encompasses subtraction, multiplication, and division as variations of adding. Another participant suggests that the concept of zero, particularly in relation to multiplication and division, simplifies mathematical operations. The conversation also touches on the uniqueness of answers in mathematics, emphasizing that while some problems may have multiple solutions, others, like the square root of 9, have a definitive answer. Ultimately, the consensus leans towards the idea that binary concepts, such as 1 and 0, represent the simplest mathematical ideas.