Spahn Feynman diagram

context: Galois theyory of renormalizations, renormalization, combinatorics, cyclotomic closure of $\mathbb{Q}$

References

• Michael Polyak, Feynman diagrams for pedestrians and mathematicians, 2004, arXiv:math/0406251v1 [math.GT]

• finite dimensional Feynman diagrams, web

• Jack Morava, the motivic Thom isomorphism, 2003. In ‘’appendix: motivic models for the little disk operad’‘ is articulated the question ‘’is the little disk operad defined over $\mathbb{Q}$?’‘ meaning: defined in the category of algebraic varieties over $\mathbb{Q}$. see also applications of operads