scholarly journals Morse index of a cyclic polygon

2011 ◽  
Vol 9 (2) ◽  
pp. 364-377 ◽  
Author(s):  
Gaiane Panina ◽  
Alena Zhukova
Keyword(s):  
Morse Index ◽  
Cyclic Polygon

scholarly journals Critical configurations of planar robot arms

2013 ◽  
Vol 11 (3) ◽  
Author(s):  
Giorgi Khimshiashvili ◽  
Gaiane Panina ◽  
Dirk Siersma ◽  
Alena Zhukova
Keyword(s):  
Critical Points ◽  
Morse Index ◽  
Robot Arms ◽  
Polygonal Chain ◽  
Oriented Area ◽  
Critical Configurations ◽  
Planar Robot ◽  
Polygonal Chains ◽  
Closed Polygon ◽  
Cyclic Polygon

AbstractIt is known that a closed polygon P is a critical point of the oriented area function if and only if P is a cyclic polygon, that is, P can be inscribed in a circle. Moreover, there is a short formula for the Morse index. Going further in this direction, we extend these results to the case of open polygonal chains, or robot arms. We introduce the notion of the oriented area for an open polygonal chain, prove that critical points are exactly the cyclic configurations with antipodal endpoints and derive a formula for the Morse index of a critical configuration.

scholarly journals A Morse index formula for radial solutions of Lane–Emden problems

2017 ◽  
Vol 322 ◽  
pp. 682-737 ◽  
Author(s):  
Francesca De Marchis ◽  
Isabella Ianni ◽  
Filomena Pacella
Keyword(s):  
Morse Index ◽  
Index Formula ◽  
Radial Solutions

Morse index and symmetry breaking for an elliptic equation with negative exponent in expanding annuli

2017 ◽  
Vol 147 (6) ◽  
pp. 1215-1232
Author(s):  
Zongming Guo ◽  
Linfeng Mei ◽  
Zhitao Zhang
Keyword(s):  
Elliptic Equation ◽  
Symmetry Breaking ◽  
Morse Index ◽  
Blow Up ◽  
Semilinear Elliptic Equation ◽  
Radial Solutions ◽  
Entire Solutions ◽  
Semilinear Elliptic ◽  
Image Position

Bifurcation of non-radial solutions from radial solutions of a semilinear elliptic equation with negative exponent in expanding annuli of ℝ2 is studied. To obtain the main results, we use a blow-up argument via the Morse index of the regular entire solutions of the equationThe main results of this paper can be seen as applications of the results obtained recently for finite Morse index solutions of the equationwith N ⩾ 2 and p > 0.

scholarly journals Morse index of radial nodal solutions of Hénon type equations in dimension two

2017 ◽  
Vol 19 (03) ◽  
pp. 1650042 ◽  
Author(s):  
Ederson Moreira dos Santos ◽  
Filomena Pacella
Keyword(s):  
Elliptic Equations ◽  
Morse Index ◽  
Radial Solution ◽  
Index Formula ◽  
Connected Components ◽  
Nodal Solution ◽  
Nodal Solutions ◽  
Semilinear Elliptic ◽  
Bounded Sets ◽  
Least Energy

We consider non-autonomous semilinear elliptic equations of the type [Formula: see text] where [Formula: see text] is either a ball or an annulus centered at the origin, [Formula: see text] and [Formula: see text] is [Formula: see text] on bounded sets of [Formula: see text]. We address the question of estimating the Morse index [Formula: see text] of a sign changing radial solution [Formula: see text]. We prove that [Formula: see text] for every [Formula: see text] and that [Formula: see text] if [Formula: see text] is even. If [Formula: see text] is superlinear the previous estimates become [Formula: see text] and [Formula: see text], respectively, where [Formula: see text] denotes the number of nodal sets of [Formula: see text], i.e. of connected components of [Formula: see text]. Consequently, every least energy nodal solution [Formula: see text] is not radially symmetric and [Formula: see text] as [Formula: see text] along the sequence of even exponents [Formula: see text].

New Results for Finite Morse Index Solutions on ℝN and applications

2010 ◽  
Vol 10 (3) ◽  
Author(s):  
E. N. Dancer
Keyword(s):  
Morse Index

AbstractWe prove new results for linearized stable and finite Morse index solutions on ℝ

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