Update README.md

README.md

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 MATHWELL is the model released in the paper [MATHWELL: Generating Educational Math Word Problems at Scale](https://arxiv.org/abs/2402.15861). 
 MATHWELL is a finetuned Llama-2 (70B) model that generates customized educational grade school math word problems and Python function solutions to these problems. Generated problems are 1) solvable, 2) accurate, and 3) appropriate. These criteria are essential to successfully supplement grade-school students’ math education. On average, 74% of MATHWELL's problems with executable solutions are solvable, accurate, and appropriate.
 
-For more details on how MATHWELL was trained and evaluated, please see our paper. Our [repo](https://github.com/bryanchrist/MATHWELL) contains a sample script for loading and interacting with MATHWELL.
+For more details on how MATHWELL was trained and evaluated, please see our [paper](https://arxiv.org/abs/2402.15861). Our [repo](https://github.com/bryanchrist/MATHWELL) contains a sample script for loading and interacting with MATHWELL.
 ## Training procedure