41. Dantzig provided formal proof in an unpublished report " A Theorem on Linear Inequalities " on January 5, 1948. 42. The point of view that generating formal proofs is all there is to mathematics is often called " formalism ". 43. Joe Gerver has given a heuristic model for the existence of 4-body singularities but at present no formal proof exists. 44. For theoretical analysis, this approach is more suited for constructing detailed formal proofs and is generally preferred in the research literature. 45. Formal verification can also be explored as an alternative to simulation, although a formal proof is not always possible or convenient. 46. He took this disparity to mean that human mathematicians are not formal proof systems and are not running a computable algorithm. 47. The definition of a formal proof is intended to capture the concept of proofs as written in the practice of mathematics. 48. Automated theorem proving refers to the development of computer programs that search and find derivations ( formal proofs ) of mathematical theorems. 49. According to these findings six American space program and the lack of any formal proof of his direct involvement in war crimes. 50. Problems inherent in the definitions used by Newton would lead to a resurgence of careful analysis and formal proof in the 19th century.