• @SmoothOperator
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      228 hours ago

      I have no idea about the numbering, but I know of at least

      • Ferromagnetism (like a fridge magnet)
      • Antiferromagnetism (opposite of ferromagnetism at an atomic level)
      • Diamagnetism (makes superconductors float)
      • Paramagnetism (like that spinny frog)

      These all indicate how a material reacts to a magnetic field. This article discusses “altermagnetism”, which is somewhere between ferromagnetism and antiferromagnetism.