Prove that any polynomial anzn + an−1zn−1 + · · · + a1z + a0 with coefficients ai ∈ Cand degree n > 0 has at least one zero in C. You may use the bijection [S1, S1] ∼= Z that associates the homotopy class of a map with the winding number of the map.
Prove that any polynomial anzn + an−1zn−1 + · · · + a1z + a0 with coefficients ai ∈ Cand degree n > 0 has at least one zero in C. You may use the bijection [S1, S1] ∼= Z that associates the homotop...
Use induction on n... 5. Use induction on n to prove that any tree on n2 2 vertices has at least two vertices of degree 1 (a vertex of degree 1 is called a leaf). 5. Use induction on n to prove that any tree on n2 2 vertices has at least two vertices of degree 1 (a vertex of degree 1 is called a leaf).