Idempotent Probability Measures on Locally Compact Abelian Semigroups Tze-Chien SunNicolas Tserpes Indiana University Mathematics Journal 1970 text pdf 10.1512/iumj.1970.19.19088 10.1512/iumj.1970.19.19088 en Indiana Univ. Math. J. 19 (1970) 1113 - 1116 state-of-the-art mathematics http://iumj.org/access/