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Fix cats equality checking #284

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merged 1 commit into from
Feb 4, 2025
Merged

Fix cats equality checking #284

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4 changes: 2 additions & 2 deletions pyzx/simulate.py
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Original file line number Diff line number Diff line change
Expand Up @@ -680,10 +680,10 @@ def check_catn(g: BaseGraph[VT, ET], vertex: VT, n: int) -> bool:
edge_type = g.edge_type(g.edge(vertex, neighbor))
if (
(edge_type != EdgeType.HADAMARD
or neighbor_type is not vertex_type)
or neighbor_type != vertex_type)
and
(edge_type != EdgeType.SIMPLE
or neighbor_type is not toggle_vertex(vertex_type))
or neighbor_type != toggle_vertex(vertex_type))
):
raise ValueError(
f'The cat {n} decomposition must act on a spider with {n} '
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