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  • 0 posts edited
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  • 71 votes cast
Jul
12
comment Probability that team $A$ has more points than team $B$
Surely you want to calculate P(A wins more games than B), which is clearly same as 1-P(B wins as many or fewer games than A). There are five games to be played. So... P(A wins more games than B) = P(A wins none and B wins none)+P(A wins one and B wins none) and so on. But there is probably some fancy way to calculate it that doesn't involve adding all the possibilities.
Jun
19
accepted Estimating total number of twin primes
Jun
14
comment Looking for group of polynomials with only real roots
I changed the question to a hopefully more constructive one
Jun
14
revised Looking for group of polynomials with only real roots
Changed the nonquestion to a, hopefully, real question
Jun
14
revised Looking for group of polynomials with only real roots
Added some notes after comments
Jun
14
comment Looking for group of polynomials with only real roots
@JimBelk how about something that has something to do with the fact that the elements of the group are polynomials? If we look at the addition, we see the operation doesn't preserve the roots at all. On the other hand, multiplication preserves them completely. So, for a starting point, this mystery operation should keep the root structure somewhat intact; at least the roots of the result should depend on the roots of the components. Would also be nice if the group had some nontrivial subgroups, for example, polynomials with rational coefficients.
Jun
14
asked Looking for group of polynomials with only real roots
Jun
8
revised Factorization by multiplying and representation as difference of two squares
Added what I had tried
Jun
8
revised Factorization by multiplying and representation as difference of two squares
Added more content
Jun
5
asked Factorization by multiplying and representation as difference of two squares
Apr
22
asked Sums of reciprocals of subsets of natural numbers
Apr
6
answered Exponents with base close to $1$.
Mar
22
comment Good way to convince a young kid that $0*0 = 0$?
What is 1*0*0? Or 0*1*0? Are they same or different to him?
Mar
22
comment How to find a sequence $(a_n)_{n>1}$ given its $n$-th partial sum is given by $S_n=\frac{8n-6}{4n+6}$?
S(n)-S(n-1) should be the nth term. So S(2)-S(1) should be second term and so on
Feb
26
comment Product of a prime and other number expressed in two ways are equal
Absolutely perfect answer, thank you!
Feb
26
accepted Product of a prime and other number expressed in two ways are equal
Feb
26
asked Product of a prime and other number expressed in two ways are equal
Feb
22
awarded  Nice Question
Feb
7
asked Distribution of $\operatorname{argmin}$
Feb
7
revised Probabilistic modelling of PSO algorithm's first iteration, mean of distribution of minimum
many corrections