Sun-Yung Alice Chang, working with Paul Yang, Tom Branson, and Matt Gursky, has produced what the American Mathematical Society has termed "deep contributions" to the study of partial differential equations in relation to geometry and topo...

in logic, the classification of syllogisms according to the arrangement of the middle term, namely, the term (subject or predicate of a proposition) that occurs in both premises but not in the conclusion. There are four figures: In the fir...

Systems of equations are a group of relationships between various unknown variables which can be expressed in terms of algebraic expressions. The solutions for a simple system of equation can be obtained by graphing, substitution, and elim...