Abstract
We present a natural proof of a recent and surprising result of Gregory Berkolaiko interpreting the Courant nodal defect as a Morse index. This proof is inspired by a nice paper of Miroslav Fiedler published in 1975.
Citation
Yves Colin de Verdière. "Magnetic interpretation of the nodal defect on graphs." Anal. PDE 6 (5) 1235 - 1242, 2013. https://doi.org/10.2140/apde.2013.6.1235
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