By S. Banach
This vintage paintings by way of the past due Stefan Banach has been translated into English in order to succeed in a but wider viewers. It includes the fundamentals of the algebra of operators, targeting the examine of linear operators, which corresponds to that of the linear varieties a
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Additional resources for Theory of Linear Operations
37) of the form f (x) =I 1 x (t) dg where IIfll a yields the following theorem: = var O~t:;;l g (t) , theorem 5, p. 35, For there to exist a function g(t) with var g(t) ~ M o~t~l and satisfying the equations 1 Ix. c· 1- I 1- 1 ~ M. x. (t) i=l 1- I • 1- II. The space L r . • , it is necessary and sufficient that. (t)! dt)r i=l ~ ~ 0 i=l ~ ~ For r=1. (t) must be integrable and the funation a(t) whiah is sought is (e§sentially) bounded and suah that I I :;; ess supla(t) M. a· ~ ~ §8. (t) dt. 0 1 i=l~ ~ Condition for the existence of solutions of certain systems of equations in infinitely many unknowns.
S+oo It consequently coincides lim xIs) whenever this limit exists in the usual sense. s+oo with Note that Lim here denotes a certain generalised "limit", while lim is reserved exclusively for limit in the usual sense. 4. Let (~n) be any bounded sequence. Define the function xIs) in xIs) =~n for n-1
If for eaah sequenae y THEOREM 10. tions 'f (8) k=l aOkSk 1- = no1- = (ni) for i=1 E: E 1 the system of equa- ,2, ... , aLways has a unique soLution (sk), there exist Linear funationaLs sk=fk(Y) for k=1,2, ••• , defined in E 1 suah that co k~laikfk(Y) = Tli for every y E: E 1 and i=1 ,2, ••• Proof. is aonvergent for eaah i=1 b) the sequenae (ni) = (k~laiksk) beLongs to E 1 • which satisfy ,2, ... , S. BANACH 30 For each pair X' = (~') k and x" = (~") k of elements of E, put: ;~~(lk~laik(~k- ~k) I), di(x',x") = It) do (x' ,x") = distance between the sequences (kI 1aik~k) and ( k~laik~k in E l and define the distance d(x',x") in E by means of the formula 00 1 di(X',x") d( - ',-") - I' d ,,,.