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Jan
30
revised quadratics wiki excerpt
$c$ was used twice in the last form; presumably it wasn't intended to force those to be equal.
Jan
30
comment Explain why catastrophic cancellation happens
I'm seeing the same thing in R. This supports the idea that this is an issue with floating-point numbers.
Jan
30
suggested approved edit on quadratics tag wiki excerpt
Jan
30
awarded  Nice Answer
Jan
29
comment Why is Multiplicative Notation Used for Groups (Instead of Additive)?
I'm not sure I'd call this "multiplicative" notation - we don't explicitly write out the multiplication sign. I think that this is a case of juxtaposition having two meanings, multiplication (when used for numeric variables) and an arbitrary group operation.
Jan
28
reviewed Close $ \exists c \in( a, b) \text{ such that } f(c)=\max\limits_{x \in [a, b]} f (x) $
Jan
28
reviewed Close Vague predicates in standard predicate logic
Jan
27
answered Value of lambda in poisson distribution
Jan
27
answered What is the coefficient of $(z-\pi)^2$ in Taylor series expansion of $\sin (z)/ (z-\pi)$
Jan
23
reviewed Leave Open how to prove: $\sum\limits_{k=1}^n k\binom{n}{k}=n \cdot 2^{n-1} $
Jan
23
reviewed Leave Open Probability of a m-long cycle
Jan
23
reviewed Close $Ax+By+Cz=D \text { has a solution iff } \gcd(\gcd(A,B),C)\mid D$
Jan
23
reviewed Close Find the sum of the series $\sum \limits_{n=1}^{\infty} \frac{2^{-n}(n+3)}{(n+1)(n+2)}$
Jan
21
answered How to show that $\sum_{k=1}^n k(n+1-k)=\binom{n+2}3$?
Jan
20
comment Mathmatical notation for a term of a polynomial
I think that's the closest there is to a standard notation. (But I honestly wouldn't use it without definition unless speaking to an audience of people who deal with generating functions all the time.)
Jan
15
answered How to solve for the parameters of the Gamma distribution given x for the 50th and 90th percentiles?
Jan
15
reviewed Leave Open Find the value of the integral $\int_{-\infty}^{\infty} \frac{1}{1+(a-y)^2} \frac{1}{1+y^2} dy$
Jan
15
reviewed Leave Open Find range of values for function to be onto
Jan
15
reviewed Leave Open Question about equivalent equations
Jan
15
comment Find a quartic (degree 4) polynomial with integer coefficients whose roots are the primitive 12th roots of unity
The polynomial $(z-\alpha_1) (z-\alpha_2) \cdots (z-\alpha_n)$ has roots $\alpha_1, \alpha_2, \cdots, \alpha_n$.