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Update README.md
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Co-authored-by: Jim Pivarski <jpivarski@users.noreply.github.com>
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Saransh-cpp and jpivarski committed Apr 23, 2024
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Expand Up @@ -163,7 +163,7 @@ and so on, for all combinations of azimuthal, longitudinal, and temporal coordin

### SymPy vectors

> Note: In order to allow SymPy simplifications to work effectively, operations on SymPy vectors are a 100% correct only if the vectors are time-like, that is, they lie in the positive time-like cone (`t**2 > x**2 + y**2 + z**2`). Operations on other vectors might output wrong results.
> **Note:** Operations on SymPy vectors are only 100% compatible with numeric vectors (Python, NumPy, and Awkward backends) if the vectors are positive time-like, that is, if `t**2 > x**2 + y**2 + z**2`. The space-like and negative time-like cases have different sign conventions.
You can directly use the `VectorSympy` and `MomentumSympy` classes to construct object type vectors:

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