(Q4223027)
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Wikipedia(5 entries)
- enwiki Petrov classification
- kowiki 페트로프 분류
- ptwiki Classificação de Petrov
- ruwiki Классификация Петрова
- ukwiki Класифікація Петрова
classification of the possible algebraic symmetries of the Weyl tensor at each point in a Lorentzian manifold