Note 1 to entry: An example of a functional of the function f(t) is ∫ t 2 t 1 f(t)dt MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGe aGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaq Fn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpe WZqaaeaaciWacmGadaGadeaabaGaaqaaaOqaamaapedabaGaamOzai aacIcacaWG0bGaaiykaKqzaeGaaiizaOGaamiDaaWcbaGaamiDamaa BaaameaacaaIYaaabeaaaSqaaiaadshadaWgaaadbaGaaGymaaqaba aaniabgUIiYdaaaa@40DD@ .