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yetanothermathprogrammingconsultant.blogspot.com | ||
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bldavies.com
Let \(A\) be the \(n\times n\) matrix with \({ij}^\text{th}\) entry \(A_{ij}=\min\{i,j\}\). From a previous post, we know \(A\) has a tridiagonal inverse \(A^{-1}\) with \({ij}^\text{th}\) entry1 $$\left[A^{-1}\right]_{ij}=\begin{cases} 2 & \text{if}\ i=j |
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www.jeremykun.com
For fixed integers $ r > 0$, and odd $ g$, a Moore graph is an $ r$-regular graph of girth $ g$ which has the minimum number of vertices $ n$ among all such graphs with the same regularity and girth. (Recall, A the girth of a graph is the length of its shortest cycle, and it's regular if all its vertices have the same degree) Problem (Hoffman-Singleton): Find a useful constraint on the relationship between $ n$ and $ r$ for Moore graphs of girth $ 5$ and degree $ r$. |
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nulliq.dev
In search of a better dot product |
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djalil.chafai.net
Les prix de l'immobilier à Paris baissent depuis la mi-2011. Cette baisse est lente et en tôle ondulée. Rien ne permet d'anticiper aujourd'hui des facteurs de hausse. L'évolution probable des facteurs structurels principaux comme la solvabilité des ménages et le vieillissement de la population suggère que la tendance à... |
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