Search results
- 1.0489299 - ÚJF 2019 RIV US eng J - Journal Article
Freitas, P. - Siegl, Petr - Tretter, C.
The damped wave equation with unbounded damping.
Journal of Differential Equations. Roč. 264, č. 12 (2018), s. 7023-7054. ISSN 0022-0396. E-ISSN 1090-2732
Institutional support: RVO:61389005
Keywords : damped wave equation * unbounded damping * essential spectrum * quadratic operator funciton with unbounded coefficients * Schrodinger operators with complex potentials
OECD category: Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)
Impact factor: 1.938, year: 2018
Permanent Link: http://hdl.handle.net/11104/0283744 - 2.0479662 - ÚJF 2018 RIV DE eng J - Journal Article
Antunes, P. R. S. - Freitas, P. - Krejčiřík, David
Bounds and extremal domains for Robin eigenvalues with negative boundary parameter.
Advances in Calculus of Variations. Roč. 10, č. 4 (2017), s. 357-379. ISSN 1864-8258. E-ISSN 1864-8266
R&D Projects: GA ČR(CZ) GA14-06818S
Institutional support: RVO:61389005
Keywords : Eigenvalue optimisation * Robin Laplacian * negative boundary parameter * Bareket's conjecture
OECD category: Pure mathematics
Impact factor: 1.676, year: 2017
Permanent Link: http://hdl.handle.net/11104/0275635 - 3.0454023 - ÚJF 2016 RIV JP eng J - Journal Article
Freitas, P. - Krejčiřík, David
Alexandrov's Isodiametric Conjecture and the Cut Locus of a Surface.
Tohoku Mathematical Journal. Roč. 67, č. 3 (2015), s. 405-417. ISSN 0040-8735. E-ISSN 0040-8735
R&D Projects: GA ČR GAP203/11/0701
Institutional support: RVO:61389005
Keywords : Alexantrov's conjecture * convex surfaces * ellipsoids * cut locus * symmetrization
Subject RIV: BE - Theoretical Physics
Impact factor: 0.359, year: 2015
Permanent Link: http://hdl.handle.net/11104/0254726 - 4.0446668 - ÚJF 2016 RIV US eng J - Journal Article
Freitas, P. - Krejčiřík, David
The first Robin eigenvalue with negative boundary parameter.
Advances in Mathematics. Roč. 280, AUG (2015), s. 322-339. ISSN 0001-8708. E-ISSN 1090-2082
R&D Projects: GA ČR(CZ) GA14-06818S
Institutional support: RVO:61389005
Keywords : Eigenvalue optimisation * Laplacian * Robin boundary condition * negative parameter * asymptotics * disproval of Bareket's conjecture
Subject RIV: BE - Theoretical Physics
Impact factor: 1.405, year: 2015
Permanent Link: http://hdl.handle.net/11104/0248681 - 5.0311171 - ÚJF 2009 RIV US eng J - Journal Article
Freitas, P. - Krejčiřík, David
Location of the nodal set for thin curved tubes.
[Lokalisace nodalni mnoziny pro tenke krive trubice.]
Indiana University Mathematics Journal. Roč. 57, č. 1 (2008), s. 343-375. ISSN 0022-2518. E-ISSN 1943-5258
R&D Projects: GA MŠMT LC06002
Institutional research plan: CEZ:AV0Z10480505
Keywords : Dirichlet Laplacian * nodal set * tubes
Subject RIV: BE - Theoretical Physics
Impact factor: 0.810, year: 2008
Permanent Link: http://hdl.handle.net/11104/0162859 - 6.0311170 - ÚJF 2009 RIV US eng J - Journal Article
Freitas, P. - Krejčiřík, David
A sharp upper bound for the first dirichlet eigenvalue and the growth of the isoperimetric constant of convex domains.
[Optimalni horni odhad na prvni dirichletovskou vlastni hodnotu.]
Proceedings of the American Mathematical Society. Roč. 136, č. 8 (2008), s. 2997-3006. ISSN 0002-9939. E-ISSN 1088-6826
R&D Projects: GA MŠMT LC06002
Institutional research plan: CEZ:AV0Z10480505
Keywords : FUNDAMENTAL-FREQUENCY
Subject RIV: BA - General Mathematics
Impact factor: 0.584, year: 2008
Permanent Link: http://hdl.handle.net/11104/0162858 - 7.0110223 - UJF-V 20043289 RIV GB eng J - Journal Article
Exner, Pavel - Freitas, P. - Krejčiřík, David
A lower bound to the spectral threshold in curved tubes.
[Dolní hranice spektrálního prahu v zakřivených trubicích.]
Proceedings of the Royal Society A-Mathematical Physical and Engineering Sciences. Roč. 460, č. 2052 (2004), s. 3457-3467. ISSN 1364-5021. E-ISSN 1471-2946
R&D Projects: GA AV ČR IAA1048101
Keywords : quantum wave-guides * polya-weinberger conjecture * states
Subject RIV: BE - Theoretical Physics
Impact factor: 1.326, year: 2004
Permanent Link: http://hdl.handle.net/11104/0017301 - 8.0089398 - ÚJF 2008 RIV NL eng J - Journal Article
Freitas, P. - Krejčiřík, David
Waveguides with combined Dirichlet and Robin boundary conditions.
[Vlnovody s kombinovanými Dirichletovými a Robinovými hraničními podmínkami.]
Mathematical Physics, Analysis and Geometry. Roč. 9, č. 4 (2006), s. 335-352. ISSN 1385-0172. E-ISSN 1572-9656
R&D Projects: GA MŠMT LC06002
Institutional research plan: CEZ:AV0Z10480505
Keywords : Dirichlet and Robin boundary conditions * eigenvalues in strips and annuli * Hardy ineguality
Subject RIV: BE - Theoretical Physics
Impact factor: 0.593, year: 2006
Permanent Link: http://hdl.handle.net/11104/0150629 - 9.0089098 - ÚJF 2008 RIV US eng J - Journal Article
Freitas, P. - Krejčiřík, David
Unbounded planar domains whose second nodal line does not touch the boundary.
[Neomezené rovinné oblasti, jejihž druhá nodální čára neprotíná hranici.]
Mathematical Research Letters. Roč. 14, č. 1 (2007), s. 107-111. ISSN 1073-2780. E-ISSN 1945-001X
R&D Projects: GA MŠMT LC06002
Institutional research plan: CEZ:AV0Z10480505
Keywords : Dirichlet Laplacian * eigenfunctions * nodal line
Subject RIV: BA - General Mathematics
Impact factor: 0.702, year: 2007
Permanent Link: http://hdl.handle.net/11104/0150435