By Payne K.R.

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**Extra info for Multiplier methods for mixed type equations**

**Example text**

When Xa ∩ Xb is dense in Xa and in Xb , then Xa = Xa , Xb = Xb , and X(a,b) = (Xa + Xb )ind . Let Xa , Xb be the conjugate duals of Xa , Xb respectively. We assume now that Xa ∩ Xb is dense in Xa and in Xb . , {Xa , Xb } is also an interpolation couple. 2. Let Xa , Xb be as above and assume that Xa ∩ Xb is dense in Xa and in Xb . Then: (i) The conjugate dual of (Xa ∩ Xb )proj is Xa + Xb . (ii) The conjugate dual of (Xa + Xb )ind is Xa ∩ Xb . Proof. The proof of both assertions results from the following two observations: (i) The conjugate dual of Xa ⊕ Xb is Xa ⊕ Xb .

1. A family Io of subsets of V is called generating for the linear compatibility # if, given any compatible pair f, g ∈ V , there exists S ∈ Io such that f ∈ S # and g ∈ S ## . Notice that elements of Io need not be vector subspaces of V , the involution automatically generates vector subspaces. But the generating character is not lost in the process. 2. Given a generating family Io of subsets of V , let J be any one of Io# , Io## , and I. Then: (i) J is a subset of F (V, #). (ii) J is generating and covers V : (iii) V # = ∩s∈J S.

1). Clearly, j(f ) is a ﬁnal subset of F : if r ∈ j(f ) and s r, then s ∈ j(f ). To get a feeling, consider the scale of Lebesgue spaces on [0,1], I = {Lp ([0, 1], dx), 1 p ∞}. Then, for every f ∈ L1 , the set j(f ) is the semi-inﬁnite interval j(f ) = {q 1 : f ∈ Lq } (the spaces are increasing to the right, with decreasing p; it would be more natural to index the spaces by 1/p, but we follow the tradition). , f ∈ Lp , but f ∈ Ls , ∀ s > p. , f ∈ Lq , ∀ q < p, hence f ∈ q p q