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Assume that $\\mathcal D_{\\max}$ with the graph norm is compactly contained in $H$ and that $\\mathcal D_{\\min}$ has finite positive codimension in $\\mathcal D_{\\max}$. Then the set of domains of selfadjoint extensions of $A_c$ has the structure of a finite-dimensional manifold $\\mathfrak {SA}$ and the spectrum of each of its selfadjoint extensions is bounded from"},"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":"1603.00382","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.FA","submitted_at":"2016-03-01T17:58:14Z","cross_cats_sorted":[],"title_canon_sha256":"0274d7815a056f4599762b527e792472dd937f4ca9b66e787e288f55d3423304","abstract_canon_sha256":"7863c1acda04761d542f23df4f380e27e1384a75a70134f982339a669c00494b"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:19:45.227201Z","signature_b64":"yj6Co53yBeSlNnU9D//Bev75AdNA1w9XX6Tf0FELAf7jzadtqoTwRShVQcOVusps6nG9wGRTbJaU2qTMLcG0Cg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1d51d7708b1aff6c849f699be235d474ecad20322c9db3781feb3339dca75dee","last_reissued_at":"2026-05-18T01:19:45.226436Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:19:45.226436Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Spectrally unstable domains","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"math.FA","authors_text":"Gerardo A. 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