Riemannian manifolds admitting more than $n-1$ linearly independent solutions of $ abla^{2}\rho+c^{2}\rho g=0$
Kwoichi Tandai · Hokkaido Mathematical Journal · 1972
Riemannian manifolds admitting more than n-1 linearly independent solutions of abla^{2}\rho+c^{2}\rho 9=O Dedicated to Prof. Yoshie Katsurada on the occassion of her sixtieth birthdayBy Kwoichi TANDAI Let M be a connected C^{\infty} -Riemannian manifold of n(\geqq 2) dimensions