Question: who proved that square root of 2 is irrational
[{'answer': 'Pythagoreans', 'provenance': [{'wikipedia_id': '341682', 'title': 'Square root of 2', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 12, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '341682', 'title': 'Square root of 2', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 582, 'bleu_score': 0.948711021715768, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13750752776734574692}, 'section': 'Section::::History.\n'}]}]