
 PlanetMath: tangent bundle (Site not responding. Last check: 20071106) 
  forgetting the tangent vector and remembering the point, is a vector bundle. 
  Crossreferences: fibers, base, obvious, section, vector field, vector bundle, tangent vector, projection, differentiable, bijective, isomorphism, derivative, map, diffeomorphism, neighborhood, isomorphic, structure, tangent spaces, disjoint union, differentiable manifold 
  This is version 2 of tangent bundle, born on 20031006, modified 20031006. 
 planetmath.org /encyclopedia/TangentBundle.html (138 words) 
