14 Answers votes newest views recent 2Question on Linear Operators 1Why is the exterior algebra so ubiquitous? 2There must be a good introductory numerical analysis course out there! 3Cardinalities larger than the continuum in areas besides set theory 18Refereeing a Paper 1If two “homogeneous” algebraic varieties are isomorphic, are they necessarily related by a linear map? 13Fundamental Examples (2) 1Set theory for category theory beginners 3Is there a stable algorithm for polynomial division (in several variables)? 3Are there elementary-school curricula that capture the joy of mathematics? 3Examples of left reversible semigroups 4One-parameter semigroups of bimodules 0Is every norm in R^n a continuous function? 8Real-world applications of mathematics, by arxiv subject area?