Bugs corrected in 'Fermions-Toy-Spectral-Function.nb'; Failed try to separate EOMs in u and x
Fermionic equations of motion with lattice imprint; solution for U(u).
Zeroth-order solution of fermionic EOMs
Merge remote-tracking branch 'upstream/master'

Conflicts:
	Fermions-Toy-Asymptotic.nb
	Fermions-Toy.nb