Equation Icon  ϕ0 (0) = ϕc, (41 ) Φ (0) = 0, (42 ) a(0) = 1, (43 ) lim ϕ0(r) = 0, (44 ) r→ ∞ -1-- lri→m∞ α (r) = lri→m∞ a(r) , (45 )