Voice-based software for doing mathematics

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My uncle is a retired math professor. He has had some serious health issues in the past year, but he is still mentally sharp. For both fun and a distraction, he has been working on a textbook. However, I believe it is hard for him since he has trouble sitting at a desk and typing. Does anyone have any recommendations for good voice-to-text software that he could use? Latex and math formatting would be very helpful, obviously, although I could possibly help here.