rigid

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rigid

(rĭ′jĭd) [L. rigidus]
Stiff, hard, unyielding.
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References in periodicals archive ?
Motivated from this, instead of the assumption "coincidence of monodromies'' in Imayoshi-Shiga's rigidity theorem, we propose here a geometric assumption for monodromies which implies that two families of Riemann surfaces are virtually isomorphic.
He covers fundamental materials of Riemannian geometry; the space of Riemannian metrics, and continuity of the eigenvalues; Cheeger and Yau estimates on the minimum positive eigenvalue; the estimation of the kth eigenvalue and Lichnerowicz-Obata's theorem; the Payne, P lya, and Weinberger type inequalities for the Dirichlet eigenvalues; the heat equation and the set of lengths of closed geodesics; and negative curvature manifolds and the spectral rigidity theorem. ([umlaut] Ringgold, Inc., Portland, OR)
Earlier examples of this phenomena [6], [1], [2] were subsumed in the Rigidity Theorem [12], [13].