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The minimal resolution of its singularities is called mixed quasi-\\'etale surface. We study the mixed quasi-\\'etale surfaces under the assumption that $(C\\times C)/G^0$ has only nodes as singularities, where $G^0\\triangleleft G$ is the index two subgroup of the elements that do not exchange the factors. We classify the minim"},"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":"1105.1259","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.AG","submitted_at":"2011-05-06T10:40:38Z","cross_cats_sorted":[],"title_canon_sha256":"a5805e15fbc5f11380296b44be534435038418a9eb8fff88c1901aa05c6af14c","abstract_canon_sha256":"741e7bc5610c5f1e4c18fd342dc4223be9acc1201011d6d26304683d96c3ff4e"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:27:23.325816Z","signature_b64":"53cS1PXPt7vjk6LbAZuWVFUVteVbyI85+dNu3O3URoi48ERMRGyQRPRn0lh9KMsGEwZNT3G4Or/WMd9ItqQWBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"32c38f1eb1ed651af62c342ef1f00f50fb8ef208c5b0f98b169ffe3c3612322e","last_reissued_at":"2026-05-18T03:27:23.325201Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:27:23.325201Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Mixed quasi-\\'etale surfaces, new surfaces of general type with $p_g=0$ and their fundamental group","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"math.AG","authors_text":"Davide Frapporti","submitted_at":"2011-05-06T10:40:38Z","abstract_excerpt":"We call a projective surface $X$ mixed quasi-\\'etale quotient if there exists a curve $C$ of genus $g(C)\\geq 2$ and a finite group $G$ that acts on $C\\times C$ exchanging the factors such that $X=(C\\times C)/G$ and the map $C\\times C \\rightarrow X$ has finite branch locus. 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