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 Exponential rank of extensions of $C^*$-algebras Bull. Korean Math. Soc. 1997 Vol. 34, No. 3, 395-401 Ja A Jeong and Gie Hyun Park Kyung Hee University, Hanshin University Abstract : We show that if $I$ is an ideal of a $C^*$-algebra $A$ such that the unitary group of $\tilde I$ is connected then $cer(A)\leq cer(I)+cer(A/I)$, where $cer(A)$ denotes the $C^{*}$-exponential rank of $A$. Keywords : exponential rank, real rank MSC numbers : 46L05 Downloads: Full-text PDF