{"id": "card_chain_gauss_1849", "kind": "reference", "title": "Gauss 1849 — Letter to Encke, 24 December 1849 (the count made in 1792–93)", "body": "C. F. Gauss (1849). Letter to Encke, 24 December 1849 (the count made in 1792–93). Werke II, 444–447. Cited by its record. License as found: public domain (the author died more than a century ago, or the work was published before 1930). What it gave the chain: the logarithmic integral li(x) as the count of primes - read off the log tables he counted primes in.", "source": {"label": "C. F. Gauss (1849), Werke II, 444–447", "url": "", "domain": "mathematics", "authority_tier": "reference"}, "shelf": "codex", "box": "chain", "bands": ["chain", "record", "1849", "gauss", "mathematics"], "subject": "Letter to Encke, 24 December 1849 (the count made in 1792–93)", "connections": [{"to_card_id": "card_chain_legendre_1798", "relationship": "builds_on", "evidence": "the logarithmic integral li(x) as the count of primes - read off the log tables he counted primes in"}, {"to_card_id": "card_chain_riemann_1859", "relationship": "enables", "evidence": "zeta continued to the plane, the functional equation, the explicit formula through log zeta, and the hypothesis"}], "author": "engine", "created_at": 0.0, "updated_at": 0.0, "visibility": "public", "lifecycle_stage": "public", "volatility": "permanent", "surface": "secular", "generated": false, "call": "codex.chain", "facets": {"subject": ["1849", "gauss", "mathematics", "record"]}, "presentation": {"glyph": "•", "kind_label": "chain", "by": "C. F. Gauss (1849), Werke II, 444–447", "authority": "reference", "posted": "", "standing": ""}, "neighbors": [{"id": "card_chain_legendre_1798", "title": "Legendre 1798 — Essai sur la théorie des nombres", "relationship": "builds on", "why": "the logarithmic integral li(x) as the count of primes - read off the log tables he counted primes in", "href": "/card/card_chain_legendre_1798", "resolved": true}, {"id": "card_chain_riemann_1859", "title": "Riemann 1859 — Über die Anzahl der Primzahlen unter einer gegebenen Grösse", "relationship": "enables", "why": "zeta continued to the plane, the functional equation, the explicit formula through log zeta, and the hypothesis", "href": "/card/card_chain_riemann_1859", "resolved": true}], "house": {"door": "FIND", "kind": "card", "trail": "connections", "seal": "/card/card_chain_gauss_1849", "next_step": {"do": "follow a connection: what this card rests on, and what rests on it", "door": "FIND", "tool": "card_connections", "params": {"id": "card_chain_gauss_1849"}}, "ends": "a verdict or a card · the trail · a seal · one next step"}}