Some subgraphs are really incredibly rich. Euler advised Lagrange. D'Alembert advised Laplace. Lagrange & Laplace both advised Poisson & Fourier. Poisson & Four

Some subgraphs are really incredibly rich. Euler advised Lagrange. D'Alembert advised Laplace. Lagrange & Laplace both advised Poisson & Fourier. Poisson & Fourier advised Dirichlet. Poisson & Cauchy advised Ostrogradsky. Poisson also advised Liouville and Chasles. Chasles->Darboux->Borel->Valiron-> Laurent Schwarz Also Chasles->Darboux->Picard-> Hadamard & Weil & Julia Hadamard -> Fréchet & Lévy -> Mandelbrot Isaac Newton, Weierstraß or Gauß are good starting points too