Progress in Partial Differential Equations by Michael Reissig & Michael Ruzhansky
Author:Michael Reissig & Michael Ruzhansky
Language: eng
Format: epub
Publisher: Springer International Publishing, Heidelberg
and evaluate the derivatives of the function (24):
By setting t=T=4ℓ(n+1) and by using the terminal conditions (25), we obtain
The half-sum and half-difference of the last two relations provide constraints for all x in the interval [0,ℓ]:
(26)
(27)
Relations (26) and (27) are equalities of elements of the class L p [0,ℓ]. In addition, note that if x is replaced by 2ℓ−x, then, by taking into account the odd extension of φ(x) and ψ(x) around the point x=ℓ, one reduces relation (27) to (26) expressed for all x in the interval [ℓ,2ℓ]. Consequently, relation (26) should be treated as an equality of elements of the class L p [0,2ℓ].
We perform the substitution m=2n−k+2 in the first sum and m=2n−k+1 in the second sum of relation (26):
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