Clarify eigensolver documentation
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@ -45,7 +45,7 @@ def solve_waveguide_mode_2d(mode_number: int,
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'''
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Shift by the absolute value of the largest eigenvalue, then find a few of the
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largest (shifted) eigenvalues. The shift ensures that we find the largest
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largest-magnitude (shifted) eigenvalues. The shift ensures that we find the largest
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_positive_ eigenvalues, since any negative eigenvalues will be shifted to the range
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0 >= neg_eigval + abs(lm_eigval) > abs(lm_eigval)
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'''
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