The Maslov index for Lagrangian pairs on $\mathbb{R}^{2n}$

We discuss a definition of the Maslov index for Lagrangian pairs on $\mathbb{R}^{2n}$ based on spectral flow, and develop many of its salient properties. We provide two applications to illustrate how our approach leads to a straightforward analysis of the relationship between the Maslov index and the Morse index for Schödinger operators on $[0,1]$ and $\mathbb{R}$.

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