qiskit/releasenotes/notes/0.18/symengine-2fa0479fa7d9aa80....

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---
upgrade:
- |
A new requirement `symengine <https://pypi.org/project/symengine>`__ has
been added for Linux (on x86_64, aarch64, and ppc64le) and macOS users
(x86_64 and arm64). It is an optional dependency on Windows (and available
on PyPi as a precompiled package for 64bit Windows) and other
architectures. If it is installed it provides significantly improved
performance for the evaluation of :class:`~qiskit.circuit.Parameter` and
:class:`~qiskit.circuit.ParameterExpression` objects.