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- W2950498944 abstract "If $S$ is a given regular $n$-simplex, $n ge 2$, of edge length $a$, then the distances $a_1$, $cdots$, $a_{n+1}$ of an arbitrary point in its affine hull to its vertices are related by the fairly known elegant relation $phi_{n+1} (a,a_1,cdots,a_{n+1})=0$, where $$phi = phi_t (x, x_1,cdots,x_{n+1}) = left( x^2+x_1^2+cdots+x_{n+1}^2right)^2 - tleft( x^4+x_1^4+cdots+x_{n+1}^4right).$$ The natural question whether this is essentially the only relation is answered positively by M. Hajja, M. Hayajneh, B. Nguyen, and Sh. Shaqaqha in a recently submitted paper entitled Distances from the vertices of a regular simplex. In that paper, the authors made use of the irreducibility of the polynomial $phi $ in the case when $n ge 2$, $t=n+1$, $x= a ne 0$, and $k = mathbb{R}$, but supplied no proof, promising to do so in another paper that is turning out to be this one. It is thus the main aim of this paper to establish that irreducibility. In fact, we treat the irreducibility of $phi$ without restrictions on $t$, $x$, $a$, and $k$. As a by-product, we obtain new proofs of results pertaining to the irreducibility of the general Cayley-Menger determinant that are more general than those established by C. D'Andrea and M. Sombra in Sib. J. Math. 46, 71--76." @default.
- W2950498944 created "2019-06-27" @default.
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- W2950498944 date "2017-01-02" @default.
- W2950498944 modified "2023-09-23" @default.
- W2950498944 title "Irreducibility of the Cayley-Menger determinant, and of a class of related polynomials" @default.
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