That's not necessarily an edge. https://www.ma.imperial.ac.uk/~buzzard/xena/formalising-mathematics-2023/Part_C/tactics/nlinarith.html https://www.ma.imperial.a

That's not necessarily an edge. https://www.ma.imperial.ac.uk/~buzzard/xena/formalising-mathematics-2023/Part_C/tactics/nlinarith.html https://www.ma.imperial.ac.uk/~buzzard/xena/formalising-math... has the example: 0 ≤ x^2 if x : ℝ which humans simply use without proof. The IMO doesn't challenge participants to prove everything, only the main ideas.