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Jul
2
awarded  Curious
Jan
16
comment Countably infinite composition of injective functions.
Wow! You've resurrected this from the grave and gave a solid answer. Thanks.
Jan
16
accepted Countably infinite composition of injective functions.
May
9
awarded  Nice Question
May
7
asked Does this graph have a name?
Jan
18
comment Differential equation - quick question (first order differential )
Have you looked into Riccati Equations?[(1),(2),(3)]
Dec
16
comment Ratio of largest eigenvalue to sum of eigenvalues — where to read about it?
@Per In principle component analysis, your formula is the proportion of variation in the first principle component, if we assume the eigenvalues are ordered from largest to smallest, i.e. $E_1 > E_2 > \cdots >E_N>0$ We do this a lot in statistics to re-orient data (without scaling) such that the $i^{th}$ eigenvalues give you a measure of variation in the $i^{th}$ eigenvector axis.
Dec
16
comment What sample size is needed to make sure that with 99% probability, the mean of the sample will be in error by at most 0.25
Are you assuming the population mean of the normally distributed population is 0? "the mean of the sample will be in error by at most 0.25?" Are you asking if $P \left(\left.\left\vert \bar{x} - \mu \right\vert < .25\right\vert \text{sample size }n\right) = .99$?
Nov
27
revised Are All Orthogonal Matrices Conformal Mappings?
Added information to answer
Nov
27
answered Are All Orthogonal Matrices Conformal Mappings?
Nov
27
asked Are All Orthogonal Matrices Conformal Mappings?
Oct
2
revised Graph Isomorphisms, Delaunay Triangulation on a sphere, and Kulikowski's Theorem
I added Polyhedra because the lattice points on the sphere can be thought of as vertices of a polyhedron.
Oct
2
comment Graph Isomorphisms, Delaunay Triangulation on a sphere, and Kulikowski's Theorem
Okay, I thought about the lattice sphere for a little bit. 1. There are 3 types of faces on the sphere. Because I don't know the basis of the lattice, I assume $\left\lbrace l_1, l_2, l_3 \right\rbrace $ is a basis and that there can be three distinct angles that can be formed, the angle between $l_1$ and $l_2$, the angle between $l_2$ and $l_3$, and the angle between $l_1$ and $l_3$. We construct the equivalence classes of $\mathcal{F}_{\left\lbrace L_i\right\rbrace_{i=1}^n }$ determined by these distinct angles formed. Also, I can think of the lattice points as vertices of a polyhedron
Oct
2
comment Graph Isomorphisms, Delaunay Triangulation on a sphere, and Kulikowski's Theorem
I'm wondering if this question is more catered to the mathoverflow. Yay? Nay? If not, then which community could best guide me to some answers?
Oct
1
asked Graph Isomorphisms, Delaunay Triangulation on a sphere, and Kulikowski's Theorem
Sep
26
comment Is there a set that is both a sigma algebra and a topology but not a powerset?
thank you for your reply.
Sep
26
awarded  Commentator
Sep
26
comment Is there a set that is both a sigma algebra and a topology but not a powerset?
@AsafKaragila thank you for your reply!
Sep
24
awarded  Supporter
Sep
24
accepted Is there a set that is both a sigma algebra and a topology but not a powerset?