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4:47 AM
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Q: Closed form roots for polynomial $x^9 + ax^6 + bx^5 + cx^3 + d = 0$

MoonwalkerI know about Abel–Ruffini theorem, but I have a polynomial of special form. From "Beyond the Quartic Equation" by R.B. King (a very interesting book, btw) I've learned about Tschirnhaus transformations which I try to use, to convert my polynomial $$ x^9 + ax^6 + bx^5 + cx^3 + d = 0$$ to the form...

 
 
2 hours later…
7:07 AM
In mathematics, a Tschirnhaus transformation, also known as Tschirnhausen transformation, is a type of mapping on polynomials developed by Ehrenfried Walther von Tschirnhaus in 1683.Simply, it is a method for transforming a polynomial equation of degree n ≥ 3 {\displaystyle n\geq 3} with some nonzero intermediate coefficients, a 1 , . . . , a n − 1...
 
 
2 hours later…
9:23 AM
This question was bumped recently. It has no top-level tag. Optimal auction for risk-averse seller
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Q: Optimal auction for risk-averse seller

MichaelConsider an auction of a single unit of indivisible good. There are $n$ buyers whose values of the object is drawn independently from the uniform distribution on $[0,1]$. The buyers have interim linear utility: $$ u_i(k(\hat{\theta}), t(\hat{\theta}));\theta_i) = \theta_i k_i(\hat{\theta}) + ...

 
 
2 hours later…
11:40 AM
0
A: What do category theorists know about "probabilistic metric spaces"?

kirk sturtzThe idea of probabilistic metric spaces sounds cool but I don't believe it is the proper way to model non-deterministic problems. You can phrase the question What is the probability that $d(x,y)\lt t$ ? quite satisfactorily within the framework of using the Kleisi category of the Giry monad $\...

Should it be "Kleisi category" or "Kleisli category"?
In category theory, a Kleisli category is a category naturally associated to any monad T. It is equivalent to the category of free T-algebras. The Kleisli category is one of two extremal solutions to the question Does every monad arise from an adjunction? The other extremal solution is the Eilenberg–Moore category. Kleisli categories are named for the mathematician Heinrich Kleisli. == Formal definition == Let ⟨T, η, μ⟩ be a monad over a category C. The Kleisli category of C is the category CT whose objects and morphisms are given by...
If it is a typo, the same typo is in the nLab article about Giry monad: ncatlab.org/nlab/show/Giry+monad
 

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