By Mischa Cotlar

ISBN-10: 0720420660

ISBN-13: 9780720420661

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Additional info for An Introduction to Functional Analysis (North-Holland Texts in Advanced Mathematics)

Sample text

Proof Suppose by contradiction that the minimal point x? x? / < 0. x? x? x? y/ Ä 0. On the other hand, in Rn n B2 we have that x? x? ˙ y/ 0. x? x? x? x? x? / dy < 0: jyjnC2s This leads to a contradiction. 3 If . /s u 0 in B1 and u unless u vanishes identically. 2. x0 / D 0. x0 y/ are non-negative, hence the latter integral is less than or equal to zero, and so it must vanish identically, proving that u also vanishes identically. 4 Assume that . Then /s u 0 in B2 , with u 0 in the whole of Rn . x/ dx; B1 for a suitable c > 0.

33) was used in the last line. This says that . x/ D jxj s . jxj s . /s ws . 5. 5 All Functions Are Locally s-Harmonic Up to a Small Error Here we will show that s-harmonic functions can locally approximate any given function, without any geometric constraints. This fact is rather surprising and it is a purely nonlocal feature, in the sense that it has no classical counterpart. Indeed, in the classical setting, harmonic functions are quite rigid, for instance they cannot have a strict local maximum, and therefore cannot approximate a function with a strict local maximum.

1 x / P:V: d! 1 ! 1 x2 / s P:V: d! C d! j2sC1 1 1 Á ! 1 ! x/ 1 C d! j2sC1 1 ! V. j2sC1 1 1 d! 1 ! 1 Z 1 d! Ã d! x/2s Z 1 d! 2 " 1 ! 1 2s Ã d! 6 A Function with Constant Fractional Laplacian on the Ball 1 ! V. 1 ! / ! 0 Z x2k 1 ! 2k " kD1 2k ! 2 /s d! 1 2s 1 ! 1 We change the variable t D ! k C 1 s; s/ D . k C 1/ . s/ kŠ . 1 s; s/ 1 X x2k kD1 . g. 1 s; s/ 1 1 Á s; ; ; x2 2 2 s; s/ F . 42) Now we write the fractional Laplacian of u as . 42) into the computation, we obtain . 0; 0; : : : ; xn / with xn 0.