Question: when does the transpose of a matrix equal the inverse
[{'answer': 'orthogonal', 'provenance': [{'wikipedia_id': '105620', 'title': 'Orthogonal matrix', 'start_paragraph_id': 1, 'start_character': 3, 'end_paragraph_id': 1, 'end_character': 13, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '105620', 'title': 'Orthogonal matrix', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 110, 'bleu_score': 0.7618274083334161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17283894418314770247}, 'section': 'Section::::Abstract.'}]}]