We extend the classical Ambarzumyan's theorem for the Sturm-Liouville equation (which is concerned only with Neumann boundary conditions) to the general boundary conditions, by imposing an additional condition on the potential function. Our result supplements the Pöschel-Trubowitz inverse spectral t
Fragments of Martin's Maximum in generic extensions
✍ Scribed by Bernhard König; Yasuo Yoshinobu
- Publisher
- John Wiley and Sons
- Year
- 2004
- Tongue
- English
- Weight
- 137 KB
- Volume
- 50
- Category
- Article
- ISSN
- 0044-3050
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
We show that large fragments of MM, e. g. the tree property and stationary reflection, are preserved by strongly (ω~1~ + 1)‐game‐closed forcings. PFA can be destroyed by a strongly (ω~1~ + 1)‐game‐closed forcing but not by an ω~2~‐closed. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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