Some results on vector bundle monomorphisms
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In this paper we use the singularity method of Koschorke  to study the question of how many different nonstable homotopy classes of monomorphisms of vector bundles lie in a stable class and the percentage of stable monomorphisms which are not homotopic to stabilized nonstable monomorphisms. Particular attention is paid to tangent vector fields. This work complements some results of Koschorke [3; 4], Libardi-Rossini  and Libardi-do Nascimento-Rossini .