Sheffer, I. M. On the theory of sum-equations. (English) Zbl 0033.37803 Bull. Am. Math. Soc. 55, 777-788 (1949). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Keywords:Functional analysis × Cite Format Result Cite Review PDF Full Text: DOI