For a representation $\unicode[STIX]{x1D70B}$ of a connected Lie group $G$ on a topological vector space $E$ we defined in [Reference Gimperlein, Krötz and SchlichtkrullGKS11] a vector subspace $E^{\unicode[STIX]{x1D714}}$ of $E$ of analytic vectors. Further, we equipped $E^{\unicode[STIX]{x1D714}}$ with an inductive limit topology. We called a representation $(\unicode[STIX]{x1D70B},E)$ analytic if $E=E^{\unicode[STIX]{x1D714}}$ as topological vector spaces.
Some mistakes in the paper have been pointed out by Glöckner (see [Reference GlöcknerGlö13]). For a representation $(\unicode[STIX]{x1D70B},E)$ and a closed $G$ -invariant subspace $F$ of $E$ we asserted in Lemma 3.6(i) that $F^{\unicode[STIX]{x1D714}}=E^{\unicode[STIX]{x1D714}}\cap F$ as a topological space. Based on that, we further asserted in Lemma 3.6(ii) that the inclusion $E^{\unicode[STIX]{x1D714}}/F^{\unicode[STIX]{x1D714}}\rightarrow (E/F)^{\unicode[STIX]{x1D714}}$ is continuous and in Lemma 3.11 that if $(\unicode[STIX]{x1D70B},E)$ is analytic then so is the restriction to $F$ . However, there is a gap in the proof of the first assertion, and presently it is not clear to us whether the above statements are then true in this generality (for unitary representations $(\unicode[STIX]{x1D70B},E)$ they are straightforward). Our proof does give the following weaker version of the two lemmas.
Lemma 1. Let $(\unicode[STIX]{x1D70B},E)$ be a representation and let $F\subset E$ be a closed invariant subspace. Then:
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(i) $F^{\unicode[STIX]{x1D714}}=E^{\unicode[STIX]{x1D714}}\cap F$ as vector spaces and with continuous inclusion $F^{\unicode[STIX]{x1D714}}\rightarrow E^{\unicode[STIX]{x1D714}}$ ;
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(ii) $E^{\unicode[STIX]{x1D714}}/E^{\unicode[STIX]{x1D714}}\cap F\subset (E/F)^{\unicode[STIX]{x1D714}}$ continuously;
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(iii) if $(\unicode[STIX]{x1D70B},E)$ is an analytic representation, then $\unicode[STIX]{x1D70B}$ induces an analytic representation on $E/F$ .
Indeed, for (iii) note that if $E$ is analytic, $E/F=E^{\unicode[STIX]{x1D714}}/E^{\unicode[STIX]{x1D714}}\cap F\subset (E/F)^{\unicode[STIX]{x1D714}}$ continuously by (ii), and $(E/F)^{\unicode[STIX]{x1D714}}\subset E/F$ continuously.
Further, we asserted in Proposition 3.7 a general completeness property of the functor which associates $E^{\unicode[STIX]{x1D714}}$ to $E$ . However, there is a gap in the proof, which asserts that $v_{i}\rightarrow v$ in the topology of $E^{\unicode[STIX]{x1D714}}$ . As statements in this generality are not needed for the main result, we can leave out the proposition (together with Remark 3.8).
Attached to $G$ we introduced a certain analytic convolution algebra ${\mathcal{A}}(G)$ . A central theme of the paper is the relation of analytic representations of $G$ to algebra representations of ${\mathcal{A}}(G)$ on $E$ : ${\mathcal{A}}(G)\times E\rightarrow E$ . In Proposition 4.2(ii), we claimed that the bilinear map ${\mathcal{A}}(G)\times {\mathcal{A}}(G)\rightarrow {\mathcal{A}}(G)$ is continuous. However, the proof shows only separate continuity. For a similar reason, we need to weaken Proposition 4.6 to the following.
Proposition 2. Let $(\unicode[STIX]{x1D70B},E)$ be an $F$ -representation. The assignment
defines a continuous bilinear map
for every $n\in \mathbb{N}$ , and a separately continuous map
(with convergence of the defining integral in $E^{\unicode[STIX]{x1D714}}$ ). Moreover, if $(\unicode[STIX]{x1D70B},E)$ is a Banach representation, then the latter bilinear map is continuous.
Proof. The first statement is proved in the article, and thus only the statement for $\unicode[STIX]{x1D70B}$ a Banach representation remains to be proved. We repeat the first part of the proof, now with $p$ denoting the fixed norm of $E$ . The constants $c,C$ such that
and $N,C_{1}$ such that
are then all fixed, and so is $\unicode[STIX]{x1D716}=1/(CC_{1})$ .
Let $n\in \mathbb{N}$ and an open $0$ -neighborhood $W_{n}\subset E_{n}$ be given. We may assume that
with $K_{n}\subset GV_{n}$ compact and $\unicode[STIX]{x1D716}_{n}>0$ . Let
The computation in the given proof shows that if $f\in O_{n}$ and $p(v)<1$ , then $\unicode[STIX]{x1D6F1}(f)v\in W_{n}$ . The asserted bi-continuity of ${\mathcal{A}}(G)\times E\rightarrow E^{\unicode[STIX]{x1D714}}$ follows.◻
As a consequence, we obtain as in Example 4.10(a), but only for Banach representations $(\unicode[STIX]{x1D70B},E)$ , that $E^{\unicode[STIX]{x1D714}}$ is ${\mathcal{A}}(G)$ -tempered. In particular, ${\mathcal{A}}(G)$ need not itself be ${\mathcal{A}}(G)$ -tempered, and we need to replace Lemma 5.1(i) by the following weaker version.
Lemma 3. $V^{\text{min}}$ is an analytic globalization of $V$ and it carries an algebra action
of ${\mathcal{A}}(G)$ , which is separately continuous.
The main result of the paper, Theorem 5.7, has two statements concerning a Harish-Chandra module $V$ with a globalization $E$ :
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(1) if $E$ is analytic ${\mathcal{A}}(G)$ -tempered, then $E=V^{\text{min}}$ ;
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(2) if $E$ is an $F$ -globalization, then $E^{\unicode[STIX]{x1D714}}=V^{\text{min}}$ .
The proof, which relied on Lemma 3.11 and Proposition 4.6, respectively, needs to be corrected. The proof of (1) if $V$ is irreducible needs no modification. For the general case it can be adjusted as follows.
Like in the paper, it suffices to consider an exact sequence of Harish-Chandra modules $0\rightarrow V_{1}\rightarrow V\rightarrow V_{2}\rightarrow 0$ , where both $V_{1}$ and $V_{2}$ have unique analytic ${\mathcal{A}}(G)$ -tempered globalizations. We show that the same holds for $V$ .
Let $E_{1}$ be the closure of $V_{1}$ in $E$ and $E_{2}=E/E_{1}$ . By Lemma 1(iii), $E_{2}$ is an analytic ${\mathcal{A}}(G)$ -tempered globalization of $V_{2}$ , so that by assumption $E_{2}=V_{2}^{\text{min}}={\mathcal{A}}(G)V_{2}$ as topological vector spaces.
In a first step we prove that $E_{1}=V_{1}^{\text{min}}={\mathcal{A}}(G)V_{1}$ as vector spaces. For that, we note first that $E_{1}$ is ${\mathcal{A}}(G)$ -tempered and that $V_{1}^{\text{min}}\subset E_{1}$ continuously. Next, by Proposition 5.3 (which holds for any ${\mathcal{A}}(G)$ -tempered representation), we may embed $E_{1}\subset F_{1}$ continuously into a Banach globalization of $F_{1}$ of $V_{1}$ . Moreover, the proof shows that the embedding is compatible with the action by ${\mathcal{A}}(G)$ . It follows that $E_{1}^{\unicode[STIX]{x1D714}}\subset F_{1}^{\unicode[STIX]{x1D714}}$ continuously and as ${\mathcal{A}}(G)$ -modules. Further, note that since $E$ is analytic, from Lemma 1(i), we also obtain $E_{1}^{\unicode[STIX]{x1D714}}=E^{\unicode[STIX]{x1D714}}\cap E_{1}=E_{1}$ as vector spaces. Hence, $V_{1}^{\text{min}}\subset E_{1}\subset F_{1}^{\unicode[STIX]{x1D714}}$ . By assumption, $V_{1}$ has a unique ${\mathcal{A}}(G)$ -tempered globalization and hence $F_{1}^{\unicode[STIX]{x1D714}}\simeq V_{1}^{\text{min}}$ . Therefore, $V_{1}^{\text{min}}\subset E_{1}\subset F_{1}^{\unicode[STIX]{x1D714}}\simeq V_{1}^{\text{min}}$ . As these maps respect the structure as ${\mathcal{A}}(G)$ -modules, the inclusion is also surjective: $V_{1}^{\text{min}}=E_{1}$ .
Being an inductive limit, $E_{1}=F_{1}^{\unicode[STIX]{x1D714}}$ is an ultrabornological space, and $V_{1}^{\text{min}}$ is webbed (see the reference in the proof of Proposition 4.6). We conclude from the open mapping theorem that $V_{1}^{\text{min}}=E_{1}$ also as topological vector spaces.
With Lemma 5.2, we now have a diagram of topological vector spaces
where the vertical arrow in the middle signifies the continuous inclusion $V^{\text{min}}={\mathcal{A}}(G)V\subset E$ , and where the rows are exact. The five lemma implies $V^{\text{min}}=E$ as a vector space, and as in the article we conclude from [DS79] that this is then a topological identity.
Finally, for (2) we recall from Corollary 3.5 that $(E^{\infty })^{\unicode[STIX]{x1D714}}=E^{\unicode[STIX]{x1D714}}$ . The Casselman–Wallach smooth globalization theorem asserts the existence of a Banach globalization $F$ of $V$ such that $F^{\infty }=E^{\infty }$ and therefore $F^{\unicode[STIX]{x1D714}}=E^{\unicode[STIX]{x1D714}}$ . In particular, $E^{\unicode[STIX]{x1D714}}$ is ${\mathcal{A}}(G)$ -tempered by Proposition 2. Now (1) applies.
Acknowledgement
The authors wish to thank Helge Glöckner for pointing out the discussed mistakes.