A seam-graded expansion turns the closed string tachyon vacuum equation algebraic at every order, reducing it to matrix inversions in the zero-momentum scalar sector.
Sen,Gauge Invariant 1PI Effective Action for Superstring Field Theory,JHEP06 (2015) 022, [1411.7478]
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Recursive-algebraic solution of the closed string tachyon vacuum equation
A seam-graded expansion turns the closed string tachyon vacuum equation algebraic at every order, reducing it to matrix inversions in the zero-momentum scalar sector.