Three counterexample families reportedly challenge a 1967 fusion-physics conjecture

A September 24 post says the papers challenge Grad’s 1967 claim that smooth 3D plasma equilibria require constant pressure or symmetry. It describes three families of counterexamples, credits GPT-6 Astra with finding two, and calls the work significant for stellarators. Another post says the AI-assisted work might have real-world applications.