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The practice of formalising mathematics is starting to attract the attention of mathematicians themselves. The main motivation is an awareness that mathematicians regularly make serious errors, some of which go undetected. But is formalised mathematics at all a realistic possibility? By now a great body of mathematics has been formalised. Unfortunately, rather little of it approaches the sophistication of modern research mathematics. Moreover, formalised proofs are typically unreadable and require lengthy blocks of code to prove obvious facts. Researchers are now formalising more advanced mathematical concepts, but much more remains to be done.