qiskit/releasenotes/notes/0.21/fix-eigs_bounds-function-in...

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---
fixes:
- |
Fixed a bug in :meth:`.TridiagonalToeplitz.eigs_bounds`, which caused
incorrect eigenvalue bounds to be returned in some cases with negative
eigenvalues. Refer to `#7939 <https://github.com/Qiskit/qiskit-terra/issues/7939>`__
for more details.