Question: who were the two mathematicians that invented calculus
[{'answer': 'Isaac Newton', 'provenance': [{'wikipedia_id': '3671687', 'title': 'Leibniz–Newton calculus controversy', 'start_paragraph_id': 1, 'start_character': 91, 'end_paragraph_id': 1, 'end_character': 103, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Gottfried Leibniz', 'provenance': [{'wikipedia_id': '3671687', 'title': 'Leibniz–Newton calculus controversy', 'start_paragraph_id': 2, 'start_character': 341, 'end_paragraph_id': 2, 'end_character': 358, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3671687', 'title': 'Leibniz–Newton calculus controversy', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6160961932994070759}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3671687', 'title': 'LeibnizNewton calculus controversy', 'section': 'Section::::Abstract.', 'start_paragraph_id': 2, 'end_paragraph_id': 2, 'meta': {'evidence_span': ['Newton claimed to have begun working on a form of calculus (which he called "the method of fluxions and fluents") in 1666, at the age of 23, but did not publish it except as a minor annotation in the back of one of his publications decades later (a relevant Newton manuscript of October 1666 is now published among his mathematical papers). Gottfried Leibniz began working on his variant of calculus in 1674, and in 1684 published his first paper employing it, "Nova Methodus pro Maximis et Minimis"', 'Gottfried Leibniz began working on his variant of calculus in 1674, and in 1684 published his first paper employing it, "Nova Methodus pro Maximis et Minimis"', 'Newton claimed to have begun working on a form of calculus (which he called "the method of fluxions and fluents") in 1666, at the age of 23, but did not publish it except as a minor annotation in the back of one of his publications decades later (a relevant Newton manuscript of October 1666 is now published among his mathematical papers). Gottfried Leibniz began working on his variant of calculus in 1674, and in 1684 published his first paper employing it, "Nova Methodus pro Maximis et Minimis".']}}]}]