Local Analytic Structure in Banach Algebras Dennis Clayton Indiana University Mathematics Journal 1971 text pdf 10.1512/iumj.1971.20.20042 10.1512/iumj.1971.20.20042 en Indiana Univ. Math. J. 20 (1971) 507 - 513 state-of-the-art mathematics http://iumj.org/access/