arXiv subjects

Nicolau Saldanha

Publications and source records attributed to Nicolau Saldanha.

4 recordsLinked to original sources

arXiv2022

Higher dimensional versions of theorems of Euler and Fuss

We present higher dimensional versions of the classical results of Euler and Fuss, both of which are special cases of the celebrated Poncelet porism. Our results concern polytopes, specifically simplices, parallelotopes and cross polytopes, inscribed in a given ellipsoid and circumscribed to another. The statements and proofs use the language of linear algebra. Without loss, one of the ellipsoids is the unit sphere and the other one is also centered at the origin. Let $A$ be the positive symmetric matrix taking the outer ellipsoid to the inner one. If $trace A = 1$, there exists a bijection between the orthogonal group $O(n)$ and the set of such labeled simplices. Similarly, if $trace A^2 = 1$, there are families of parallelotopes and of cross polytopes, also indexed by $O(n)$.

math.MG↗

arXiv2021

Remarks on the homotopy type of intersections of two real Bruhat cells

In a companion manuscript, we introduce a stratification of intersections of a top dimensional real Bruhat cells with another arbitrary cell. This intersection is naturally identified with a subset of the lower triangular group: these subsets are labeled by elements of a finite group, the lift to the spin group of the intersection of a Coxeter group with the special orthogonal group. The stratification allows us to determine the homotopy type of the intersection. In this work we give more examples, particularly detailing the computation of the intersection of two open Bruhat cells in general position for $n=4$. It turns out that all connected components are contractible.

math.AT↗

arXiv2020

Grassmann convexity and multiplicative Sturm theory, revisited

In this paper we settle a special case of the Grassmann convexity conjecture formulated earlier by B.and M.Shapiro. We present a conjectural formula for the maximal total number of real zeros of the consecutive Wronskians of an arbitrary fundamental solution to a disconjugate linear ordinary differential equation with real time. We show that this formula gives the lower bound for the required total number of real zeros for equations of an arbitrary order and, using our results on the Grassmann convexity, we prove that the aforementioned formula is correct for equations of orders $4$ and $5$.

math.CA↗

arXiv2018

Combinatorialization of spaces of nondegenerate spherical curves

A parametric curve $γ$ of class $C^n$ on the $n$-sphere is said to be nondegenerate (or locally convex) when $\det\left(γ(t),γ'(t),\cdots,γ^{(n)}(t)\right)>0$ for all values of the parameter $t$. We orthogonalize this ordered basis to obtain the Frenet frame $\mathfrak{F}_γ$ of $γ$ assuming values in the orthogonal group $\operatorname{SO}_{n+1}$ (or its universal double cover, $\operatorname{Spin}_{n+1}$), which we decompose into Schubert or Bruhat cells. To each nondegenerate curve $γ$ we assign its itinerary: a word $w$ in the alphabet $S_{n+1}\smallsetminus\{e\}$ that encodes the succession of non open Schubert cells pierced by the complete flag of $\mathbb{R}^{n+1}$ spanned by the columns of $\mathfrak{F}_γ$. Without loss of generality, we can focus on nondegenerate curves with initial and final flags both fixed at the (non oriented) standard complete flag. For such curves, given a word $w$, the subspace of curves following the itinerary $w$ is a contractible globally collared topological submanifold of finite codimension. By a construction reminiscent of Poincaré duality, we define abstract cell complexes mapped into the original space of curves by weak homotopy equivalences. The gluing instructions come from a partial order in the set of words. The main aim of this construction is to attempt to determine the homotopy type of spaces of nondegenerate curves for $n>2$. The reader may want to contrast the present paper's combinatorial approach with the geometry-flavoured methods of previous works.

math.GT↗