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Sucks almost as much as this:

H = -2J₁(S_A.S_B)-2J₂(S_A.S_C+S_A.S_D+S_B.S_C+S_B.S_D)

Of course, when J₁ is greater than ~75 K, it all goes to shite.

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Colonel Boris "...a desperate Buzzfeed imitation...", Mon 25 Feb 2008, 19:49, archived)

thermodynamics?

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The Alchemist king of the needlessly complicated, Mon 25 Feb 2008, 19:56, archived)

Magnetism

It describes the energy levels in two systems I'm investigating. One has four copper atoms and has six energy states, which Origin 6 pro can deal with on a decent computer. The other has four mixed-valence manganese atoms and has 110 energy states, which make Origin shut down without a chance to save your work.
Crappy.

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Colonel Boris "...a desperate Buzzfeed imitation...", Mon 25 Feb 2008, 19:59, archived)

Just write it out on the back of a napkin.

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my other username is a porsche , posting shit pictures so you don't have to, Mon 25 Feb 2008, 20:01, archived)

Pretty big napkin...

Of course, when you've worked out each energy level, you have to input each one into the Van Vleck-Dirac-Heisenberg equation to calculate the susceptibility.
which is just what I was saying to the vicar the other day...

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Colonel Boris "...a desperate Buzzfeed imitation...", Mon 25 Feb 2008, 20:05, archived)

Sounds like you have a rather enjoyable evening ahead of you.

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my other username is a porsche , posting shit pictures so you don't have to, Mon 25 Feb 2008, 20:08, archived)

This is correct.

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Mod Edit, Mon 25 Feb 2008, 20:07, archived)

Hmmm. Sounds interesting. Like an enzyme active site. I think photosystem II has 4 Mn atoms.

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The Alchemist king of the needlessly complicated, Mon 25 Feb 2008, 20:10, archived)

I might have worked on that

But it's a different system I'm on at the moment...

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Colonel Boris "...a desperate Buzzfeed imitation...", Mon 25 Feb 2008, 20:43, archived)