I'm interested in understanding foundational issues in QM more deeply. For example, I'd like to be able to read and understand the literature on the Transactional Interpretation of QM and the Many-Worlds Interpretation, as well as the literature on decoherence. What can you recommend for a study program? I'm looking both for reading material and worked problem sets. I'm more interested in foundational issues than computational techniques. Here's my background: - B.S. physics (applied), Ph.D. computer science - I had one undergrad QM course (for the applied physics program) and one quarter of grad-level QM... but that was 24 years ago, and I haven't done any physics since. I've had very little exposure to quantum field theory, apart from the layman's treatment in Feynmann's book _QED_. - I'm good with linear algebra, probability theory / statistics, and calculus at the level used in undergraduate physics. Mathematical formalism doesn't scare me. I've had some exposure to the calculus of variations and complex analysis, but not a lot. What do you recommend?