1. A variety of general results concerning possible summability  methods are known. 2. Results about summability  can also imply results about regular convergence. 3. Summability  conditions are discussed in detail in Boas & Buck.4. He was also interested in summability  theory, infinite games and computable functions. 5. Since then, mathematicians have explored many different summability  methods for divergent series. 6. Rainwater's theorem is an important result in summability  theory and functional analysis. 7. By nature, the definition of unconditional summability  is insensitive to the order of the summation. 8. :: That doesn't make much sense in the case of the summability  criterion. 9. Together with his student Simson Baron he started to describe the summability  factors for double series. 10. Was first considered by Euler, who applied summability  methods to assign a finite value to the series.