Math 546 versus Math 648-649: The graduate probability course Math 648-649 has bifurcated into two courses, Math/AMCS 546 and Math 648-649 (cross-listed Stat 930-931). Both involve the foundations of measure theoretic probability theory. Math 648 spends more time on proofs of the major theorems. It is intended for Ph.D. students in areas such as math and statistics, whose research may involve creating new theorems. The new 546 is also a measure-theoretic treatment and handles the definitions and constuctions at the same level as does Math 648-649. However, it replaces some of the time spent on proofs of classical theorems with the formulation and analysis of probability models. For example these may include hidden Markov models, latent Dirichlet models, micro-arrays, theory of information channels, stochastic approximation and gradient descent, preferential attachment, and randomized algorithms. Math 546 is intended for students planning graduate study in any field that makes use of probability. While it is presently only a one-semester course, the topic coverage will not be restricted to 648 but will cover a good part of 649 as well. Teaching methodology will be project oriented and partially flipped, giving students a chance to spend significant class time on deeper study of specific models of interest to them. We strongly urge any student other than Math and Stat Ph.D. students to check out both. Math 648-649 meeets this year MW 12:00-1:30. Math 546 is offered in the spring semester this year and meets MW 12:00-1:30.