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Using exact many-electron ground states in the subspaces with $n\\le n_{\\max}$ ($n_{\\max}\\propto N$) electrons, we calculate the square of the total spin in the ground state to discuss magnetic properties of the models. We have found that although for $n<n_{\\max}$ the ground states contain fully polarized states, there is no finite region of electron densities $n/{\\cal{N}} <1$ (${\\cal{N}}=N/3$ or ${\\cal{N}}=N/5$) where ground-state fer"},"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":"1009.3827","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2010-09-20T14:08:00Z","cross_cats_sorted":[],"title_canon_sha256":"091e7f38d631b66ce87329f5b84a6d0198ad959424d0a62a6dab8d628f4f74c0","abstract_canon_sha256":"4913339f7dcb196253db6461d3f5997a8abe65a114e1a54cc033d26864ac3529"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:33:38.774657Z","signature_b64":"KB0EDWEp5jOQI/HJMv+wSFYJb8fnnfALk5Dsnn7GoXbuNFrwFHu1HXD3dy5KMhgZn2nguwVxkUNXTdE6mHosCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c1a7d21c09ff5958d230c74077629a140662152622569ed7fc6eb9f410a6b2c3","last_reissued_at":"2026-05-18T04:33:38.774146Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:33:38.774146Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Magnetic properties of the Hubbard model on kagome stripes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.str-el","authors_text":"A. 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