/sci/ - Science & Math

>>3467117
It's the partition function of a (simple) spin system getting ready for renormalization (note the cut-off-y parameter <span class="math">\Lambda[/spoiler]) (Inb4 cutoff sucks. It's not cutoff.). It's not that complicated if you've seen where it comes from and understand where it's supposed to lead you.

Fun (read: asshole) exercise to learn inventing and using new notation on the fly: Prove the Jacobi identity on the pic.