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Moreover, if x in J_C[2] is a 2-torsion point let R(x) be the Recillas tetragonal curve whose Jacobian is isomorphic to Prym(C,x). Then there is an injection of SU_R(x)(2) into N_C giving a `nonabelian Schottky configuration' in N_C s"},"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":"math/9907114","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"math.AG","submitted_at":"1999-07-19T10:08:51Z","cross_cats_sorted":[],"title_canon_sha256":"e7e077909e5b0410ccc7da617b329172e4540c79a72919e2190ff84bd4855554","abstract_canon_sha256":"a36bda9bc32f2169c6055609c6b96e26c3cf52e89c9e862b6e2456a182e46d00"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T14:41:14.546145Z","signature_b64":"lm3pm5dDL7E9gjJl4oAuVHA1665LUN5XQCVIV/O2b8/BoSFAvemrKpXreuMNRHf0l+nhwFPhspWJI+8GKcRAAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a5eb67512b3fb8221e0d9afe239c990c7d9fd16b8f3b95999731543688f7f1f6","last_reissued_at":"2026-07-04T14:41:14.545781Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T14:41:14.545781Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Trigonal curves and Galois Spin(8)-bundles","license":"","headline":"","cross_cats":[],"primary_cat":"math.AG","authors_text":"S. 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