{ "items" : [
    { "id" : "http://dbpedia.org/resource/Betti's_theorem"
      "properties" : {
        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "Betti's theorem,  also known as Maxwell-Betti reciprocal work theorem, discovered by Enrico Betti in 1872, states that for a linear elastic structure subject to two sets of forces {Pi} i=1,...,m and {Qj}, j=1,2,...,n, the work done by the set P through the displacements produced by the set Q is equal to the work done by the set Q through the displacements produced by the set P."] } } }
