Questions (209)

 22 When to use the contrapositive to prove a statment 19 Why is continuity characterized with open sets? 15 Why does the fixed point theorem justify the existence of the factorial function? 14 Why doesn't the definition of dependence require that one can expresses each vector in terms of the others? 14 How do you compute numerically the Earth mover's distance (EMD)?

Reputation (1,975)

 +5 Why is continuity characterized with open sets? +5 A list of different measures of distance/difference/dissimilarities/similarity of two probability distributions? +5 What is the relationship of the EMD (Earth movers Distance) and total variation (and other probability measures)? +5 Why is the topological definition of continuous the way it is?

 4 In the category $\mathbf{Set}$ is “the product of an empty set of sets a one-element set”? 4 Proof that the Euclidean norm is indeed a norm 3 Why is $Th(\Sigma) := \{ \sigma : \Sigma \vdash \sigma \}$ an L-theory? 1 How can I correct my wrong Intuition that $\forall \, x \, \in \,\emptyset : P(x) \quad$ is false? 1 How to prove that the set $A = \left\{ {p:{p^2} < 2,p \in {\Bbb Q^+}} \right\}$ has no greatest element?

Tags (149)

 4 logic × 49 3 predicate-logic × 27 4 vector-spaces × 8 3 first-order-logic × 24 4 category-theory × 5 2 calculus × 14 4 norm × 4 1 real-analysis × 34 4 direct-product × 2 1 number-theory × 11