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This is the stringy generalisation of the classical theorem, due to Mukai and Kondo, showing that the symplectic automorphisms of any K3 manifold form a subgroup of the Mathieu group M_{23}. The Conway group Co_1 contains the Mathieu group M_{24} (and therefore in particular M_{23}) as a subgroup. We confirm the predictions of the Theorem with three explicit CFT realisations of K3: the T^4/Z_2 orbifold at the self-dual point, and the two Gepner models (2"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1106.4315","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2011-06-21T20:02:22Z","cross_cats_sorted":[],"title_canon_sha256":"b212820bd09619a81f43577f2bc6bf73776196de2ccb1521e96915538c5926a8","abstract_canon_sha256":"491ca11f5598252a38fe162cea8c6fbfcc4d6775e281a7503ac3795b7707b76b"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:36:04.986401Z","signature_b64":"7pukx5b+A8eKCuZatMQevJGdFm+JAk9e1dV5lP/lmHGj6t0Z62epI61irY1JXG2eXRd66Yy/iC48GJb5+1LpCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"856d643ec53238f1f21f935ea8d6a4c4c97733f3b446970cd3a608778458795e","last_reissued_at":"2026-05-18T03:36:04.985696Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:36:04.985696Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Symmetries of K3 sigma models","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-th","authors_text":"Matthias R. 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