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It's difficult to go very far in physics without knowledge of advanced mathematics. But a study in The New Journal of Physics found that physicists pay less attention to theories that are full of mathematical details. Tim Fawcett and Andrew Higginson, both from the University of Exeter, analyzed the number of citations in 2,000 articles in a leading physics journal and found that articles are less likely to be referenced by other physicists if they have lots of mathematical equations on each page.