The speaker in the talk discuss the very crucial fact of axioms and extent of equation. Condensed matter physics lies in the extremities of two Newtonian physics(Classical Physics) and Nuclear physics. Even though we have an axioms in the the Condensed Matter Physics but we are not being able to solve an equations in simpler forms. So problem in this field is to apply the equations of QM in a way that they becomes easily solvable. Great Talk, I love it indeed.