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visits member for 3 years, 11 months
seen Aug 17 at 1:45

Sep
16
awarded  Yearling
Aug
29
revised What is the combinatoric significance of an integral related to the exponential generating function?
fixed punctuation, wording.
Aug
29
awarded  Revival
Aug
1
comment Is there a Hamiltonian path for the graph of English counties?
Nice! quick and easy.
Aug
1
comment Is there a Hamiltonian path for the graph of English counties?
Kudos...but magic trick over. Now you have to tell us how you did that. By hand or by running algorithm (if so then by what system)? And also, how did you create such a nice picture? You lifted it somewhere? There's no shame in that, but at least give a link.
Jul
28
comment Trouble with filling out a Cayley table
$u*u = p$. What is $u*u*u$?
Jun
8
awarded  Constituent
Jun
8
awarded  Caucus
Jun
8
answered To prove : Perfect square
May
9
revised Where does binary arithmetic/manipulation enter the mathematics/engineering curriculum?
extra question
May
9
asked Where does binary arithmetic/manipulation enter the mathematics/engineering curriculum?
Apr
25
comment History of dot product and cosine
The dot product as an explicit algebraic operation is not so necessary to the 'dischord of appearances', it is the $a d + b e + c f$ a decidedly open calculation in comparison to the obscurantist length of a vector and angle formula (requiring much more machinery). Any idea if this (what Hamilton knew) was popular before Gibbs?
Apr
10
comment How do you explain the concept of logarithm to a five year old?
@DanNeely: Yes, you're right. There are many contexts where an explanation could work/be meaningful and useful to a 5 yar old (JohnS keeps coming up with good ones). I think I was caught up in the symbol manipulation. But I still think the simple 'number of digits' concept, which would totally work for older kids (8-10 yoa) would be obscurantist to even a curious 5 year old.
Apr
8
comment How do you explain the concept of logarithm to a five year old?
To a -5- year old? Aren't you stretching the limits of relevance? Most (even bright) kids are only about to 'get' negative numbers (which is arguably a much prior concept (inverse of addition) that is much more accessible. If this is just for fun (for a child that can 'get' things), then @JohnS's example looks to be aan excellent idea with lo-tech/lo-conceptual overhead.
Mar
29
comment Bounding ${n \choose k}$
${n \choose k}$ increases up to $k = \lfloor n/2 \rfloor$, then goes down. So you only really need to worry about the left side up to the max.
Mar
25
comment Pseudo Proofs that are intuitively reasonable
Isn't everything rigorous until you throw some doubt on it (which further elucidation (notational conventions, development of concepts) makes more rigorous)?
Feb
28
revised Connecting finite automata and regular languages in teaching/applications
added links
Feb
28
comment How to pronounce $\setminus$
But is that the way you in practice pronounce it?
Feb
28
comment “Binomial theorem”-like identities
@anon: falling factorials are counting (iteratively) selection without replacement (and rising factorials do the same starting from the top).
Feb
25
asked Connecting finite automata and regular languages in teaching/applications