Which AI feature was first introduced by the mathematics e-learning platform Brilliant.org that revolutionized how students receive feedback on proof-based problems?

In recent years, artificial intelligence has transformed how mathematics is taught and learned online. E-learning platforms specialized in mathematics now employ sophisticated algorithms to personalize learning paths, identify knowledge gaps, and adapt content difficulty. This poll tests your knowledge about recent innovations in AI-powered mathematics education platforms and how they're changing the landscape of mathematical learning and instruction.

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Natural Language Processing (NLP) that evaluates written mathematical proofs and provides specific feedback on logical reasoning errors
Augmented Reality (AR) visualization of complex mathematical concepts that adapt based on student interaction patterns
Sentiment analysis algorithms that detect student frustration and automatically adjust problem difficulty
Real-time collaborative proof building with AI suggestion system based on thousands of expert-created solutions