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The First Fundamental Theorem of Invariant Theory for the Orthosymplectic Supergroup

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Abstract

We give an elementary and explicit proof of the first fundamental theorem of invariant theory for the orthosymplectic supergroup by generalising the geometric method of Atiyah, Bott and Patodi to the supergroup context. We use methods from super-algebraic geometry to convert invariants of the orthosymplectic supergroup into invariants of the corresponding general linear supergroup on a different space. In this way, super Schur–Weyl–Brauer duality is established between the orthosymplectic supergroup of superdimension (m|2n) and the Brauer algebra with parameter m − 2n. The result may be interpreted either in terms of the group scheme OSp(V) over \({{\mathbb C}}\), where V is a finite dimensional super space, or as a statement about the orthosymplectic Lie supergroup over the infinite dimensional Grassmann algebra \({\Lambda}\). We take the latter point of view here, and also state a corresponding theorem for the orthosymplectic Lie superalgebra, which involves an extra invariant generator, the super-Pfaffian.

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Authors and Affiliations

  1. School of Mathematics and Statistics, University of Sydney, Sydney, NSW, 2006, Australia

    G. I. Lehrer & R. B. Zhang

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  1. G. I. Lehrer
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  2. R. B. Zhang
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Correspondence to G. I. Lehrer.

Additional information

Communicated by Y. Kawahigashi

This research was supported by the Australian Research Council.

The first author thanks the Mittag-Leffler Institute, Stockholm, for hospitality during the preparation of this manuscript.

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Lehrer, G.I., Zhang, R.B. The First Fundamental Theorem of Invariant Theory for the Orthosymplectic Supergroup. Commun. Math. Phys. 349, 661–702 (2017). https://doi.org/10.1007/s00220-016-2731-7

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