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seen Apr 20 at 22:37

Apr
20
comment Is the size of the Online Encyclopedia of Integer Sequences bounded by aleph-null?
So, the sequences that exist have the cardinality of the continuum, the sequences that we can ever describe have the cardinality of the integers, and the sequences that we ever have described have finite cardinality? Aleph-two and beth-two for example are entirely out of the question, I think? I'm not 100% clear on uncountables.
Apr
20
asked Is the size of the Online Encyclopedia of Integer Sequences bounded by aleph-null?
Mar
6
awarded  Tumbleweed
Mar
1
revised How to handle “positive difference or zero”?
added 209 characters in body; edited tags
Mar
1
revised How to handle “positive difference or zero”?
my bad, MathJaX for math.se not TeX The World for Chromium
Feb
27
asked How to handle “positive difference or zero”?
Feb
22
awarded  Yearling
Nov
16
awarded  Benefactor
Nov
9
comment Why is ${x^{\frac{1}{2}}}$ the same as $\sqrt x $?
We might think it's equally sensible to define the special case $0^0$ as $0$, but the mathematical convention for that is indeed $0^0 = 1$ in accord with the explanation above.
Nov
9
revised Is there a rational way to conceptualize an irrational number?
I had reversed the footnotes (links)? Fixed.
Nov
9
comment What are the most overpowered theorems in mathematics?
"The Axiom of Choice is obviously true; the Well Ordering Principle is obviously false; and who can tell about Zorn's lemma?" — Jerry Bona. I like how that joke sums up intuitions (rather than logic) regarding the Axiom of Choice and Zorn's Lemma.
Nov
9
awarded  Promoter
Nov
9
comment We know the dimension of the Koch snowflake's perimeter, but does it have a measure?
It has a positive and finite Hausdorff measure, am I right? I haven't carefully read and thought through what Hausdorff measure is all about.
Nov
9
comment How to put 9 pigs into 4 pens so that there are an odd number of pigs in each pen?
Horrible, yes. But logically, what's wrong with questioning the mathematical model that pairs integers with pigs? They can indeed literally disintegrate.
Oct
28
comment We know the dimension of the Koch snowflake's perimeter, but does it have a measure?
Relevant I think? So, it is quite difficult indeed? dx.doi.org/10.1016/j.amc.2007.01.046
Oct
28
revised We know the dimension of the Koch snowflake's perimeter, but does it have a measure?
Oops I meant the third vertex - clearly a triangle's sides, let alone its interior, contain infinitely many points.
Oct
28
asked We know the dimension of the Koch snowflake's perimeter, but does it have a measure?
Oct
28
revised How is a system of axioms different from a system of beliefs?
Mention that although counting isn't as factual as it may seem, counting isn't broken either.
Oct
28
answered How is a system of axioms different from a system of beliefs?
Aug
5
comment Find the smallest $n$ such that the digits in $2^n$ have every digit from $1$ to $9$
Is there a standard definition of "brute force"? Maybe we can claim that there's something clever about doubling decimal digits rather than multiplying them by any other constant. Doubling 1024 obviously produces another number with four distinct digits because 0,1,2,and 4 are all in the lower half of the decimal digits.