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Apr
10
comment Classifying Types of Paradoxes: Liar's Paradox, Et Alia
@Memming That's what I wanted. Thanks.
Apr
10
revised Classifying Types of Paradoxes: Liar's Paradox, Et Alia
Changed the reference.
Jan
15
answered How to proove the following general form of proof
Dec
10
awarded  Caucus
Oct
30
comment discuss convexity of the following set?
mfl's suggestion to plot the region is a very good idea.
Oct
9
reviewed Looks OK Conditional Integral of Square of Brownian Motion?
Oct
6
answered Subset Relation: Is the subset relation a partial order?
Oct
6
answered Prove that if X is a subset of Y then X intersect Z is a subset of Y intersect Z for all sets X, Y, Z.
Sep
24
awarded  Autobiographer
Sep
8
comment The family of finite unions of half-open intervals forms a ring of sets
It the nth term and the mth term do not intersect then you have written the empty set in a complicated way. You can delete all these different versions of writing the empty set.
Sep
8
comment Why is the set of functions from the naturals to the rationals a subset of $\mathcal P(\mathbb N \times \mathbb Q)$?
What is your definition of a function? What is your definition of an element of $\mathcal{P}(\mathbb{N} \times \mathbb{Q})$?
Sep
8
comment The family of finite unions of half-open intervals forms a ring of sets
Use the distributive property for $A \cap B$. See what you get.
Aug
2
accepted Are there necessary and sufficient conditions for Krein-Milman type conclusions?
Aug
2
accepted Are there necessary and sufficient conditions so that every element in a partially ordered set is either the least element or in the upset of an atom?
Aug
2
accepted Conditions for augmenting a collection of sets so that the new sets are small but the hull is large?
Jul
2
awarded  Curious
Jun
7
answered How is derived the inductive step in mathematical induction?
Jun
3
reviewed Looks OK How to get Speed from Velocity with Integral
May
29
comment Study of all published works of Bertrand Russell on foundations of mathematics: Please recommend his works.
As I recall Principia is page after page after page of proofs using formal logic with few if any words in English or any other human readable language. There are good reasons why this method of mathematical exposition did not catch on.
May
27
reviewed No Action Needed What's the most combinations i can have in a matrix?