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visits member for 1 year, 8 months
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Feb
23
answered True or false? $(X\setminus Y)\cup(Y\setminus Z)\cup(Z\setminus X) = X\cup Y\cup Z$, for any sets $X$, $Y$, $Z$.
Feb
9
comment Does the graph of a continuous function have an empty interior?
I think you're confusing image with graph.
Jan
26
answered Class Transitivity Proof
Jan
14
revised Set theory aspects of category theory
added 11 characters in body
Jan
14
comment Set theory aspects of category theory
@ZhenLin Yeah, I was kind of hoping for the converse, so the assumption of the existence of the universe would sound more acceptable, with a proof like "ZFC consistent -> has model -> has transitive model", but I guess the model given by consistency is not necessarily good enough (well-founded) for the Mostowski collapse.
Jan
14
answered Set theory aspects of category theory
Nov
2
awarded  Yearling
Sep
5
comment Question on Zorn's lemma
dkuper: Bounded chains in $\mathbb Q$ do have an upper bound but may lack a least upper bound.
Jun
18
answered How to teach mathematical induction?
Feb
13
comment Plotting a Function of a Complex Variable
This might be helpful.
Jan
22
awarded  Informed
Jan
20
comment Special properties of $\mathbb{R}^3$
Hmm, well I guess the question is vague enough that it could be...
Jan
20
comment Special properties of $\mathbb{R}^3$
Since this doesn't answer the question, don't you think it should be a comment?
Dec
31
revised Showing that $\sum \frac{\log n}{n^x}$ converges for $x>1$
improved formatting
Dec
31
reviewed Reviewed Showing that $\sum \frac{\log n}{n^x}$ converges for $x>1$
Dec
31
suggested suggested edit on Showing that $\sum \frac{\log n}{n^x}$ converges for $x>1$
Dec
31
revised Local compactness in an open subset
fixed grammar
Dec
31
suggested suggested edit on Local compactness in an open subset
Dec
31
answered Power set difference on the same set.
Dec
27
reviewed No Action Needed Count the the number of elements in a set, exactly divisible by 2 out of 3 numbers