TY - JOUR AU - Connelly, Robert TI - Rigidity and Energy. JO - Inventiones mathematicae PY - 1982 VL - 66 SP - 11 EP - 34 KW - energy methods; rigidity; framework; convex polygon; rods; cables; energy functions; stress; equilibrium; quadratic form; bars; struts; Cauchy lemma UR - http://eudml.org/doc/142866 ER -