41. Thomas Breuer in 1994 had proven that physical theories valid for the whole universe are impossible. 42. Addition is a physical theory discovered from observations. 43. Regularization : This process shows that the physical theory originally used breaks down at small scales. 44. The formal laws of a physical theory are justified by a process of repeated controlled observations. 45. Explanation of these phenomena requires more sophisticated physical theories , including general relativity and quantum field theory. 46. The effort to put physical theories on a mathematically rigorous footing has inspired many mathematical developments. 47. This requires physical theory for thermal conduction and convection and the heat contribution of radioactive elements. 48. It's not a physical theory by itself. 49. Mr . Lazar on many occasions demonstrates an obvious lack of understanding of current physical theories ." 50. Its findings have dramatically challenged physical theory .
