TY - CHAP A1 - Flarup Hansen, Uffe A1 - Meer, Klaus ED - Jedrzejowicz, Joanna T1 - Two logical hierarchies of optimization problems over the real numbers T2 - Mathematical Foundations of Computer Science 2005, 30th International Symposium, MFCS 2005, Gdansk, Poland, August 29 - September 2, 2005 Y1 - 2005 SN - 978-3-540-29702-5 SP - 459 EP - 470 PB - Springer CY - Berlin ER - TY - CHAP A1 - Flarup Hansen, Uffe A1 - Meer, Klaus ED - Calude, Cristian T1 - Approximation classes for real number optimization problems T2 - Extended abstract, 5th International conference on Unconventional Computation, York, UK, September 4-8, 2006 Y1 - 2006 SN - 978-3-540-38593-6 SP - 86 EP - 100 PB - Springer CY - Berlin ER - TY - GEN A1 - Flarup Hansen, Uffe A1 - Meer, Klaus T1 - Two logical hierarchies of optimization problems over the real numbers T2 - Mathematical Logic Quaterly Y1 - 2006 SN - 0942-5616 VL - 52 IS - 1 SP - 37 EP - 50 ER -