. . . . "Symmetry expansion of the first COD diamond CIF (by id) in Fd-3m that yields 8 full-occupancy carbons per cell; neighbours within 1.1 times the shortest C-C distance counted and bond angles computed in a 3x3x3 block." . . "Measured: 0 largest deviation of a C-C-C bond angle from 109.47 degrees in the refined diamond structure (degrees) (n = 48). Interpretation: The geometry follows exactly from the space group and the Wyckoff position 8a, so a refined structure in Fd-3m with carbon on 8a passes by construction; the empirical content is that diamond refines in that space group with that site, which is what the CIF records. A single structure is enough for the geometry; the number of independent CIFs found is reported." . "Claim test of bragg1915-03: supports, confidence 0.95" . . . "Planned datasets: cod-search-api" . "claim-test/0.1.0" . "physical" . "Coordination number other than 4, or any angle off by more than 1 degree: refutes. Angles between 0.1 and 1 degree off: mixed. No ambient Fd-3m diamond CIF with coordinates in the COD: inconclusive." . "Deviation: COD writes the space group with an origin-choice suffix ('F d -3 m :1' or ':2'); the suffix is stripped before matching the pre-registered symbol." . "Deviation: Entries whose CIF does not expand to 8 full-occupancy carbon positions (the pre-registered Z = 8) are skipped and listed in results.skipped_entries; the first remaining entry by COD id is used." . "Passes by construction for any structure refined in Fd-3m with carbon on 8a; the empirical content is that diamond refines there." . "Two CIFs were skipped (one with partial occupancy at a displaced site, one with no parseable coordinates) and are listed in results.skipped_entries." . "From the atomic coordinates of a COD diamond CIF (formula C, space group F d -3 m, Z = 8, ambient), expanding symmetry to a 3x3x3 block: every carbon has exactly 4 neighbours within 1.1 times the shortest C-C distance, that distance equals a sqrt(3)/4 within 0.1 per cent, and every bond angle is within 0.1 degree of 109.47: supports." . "Coordination number other than 4, or any angle off by more than 1 degree: refutes. Angles between 0.1 and 1 degree off: mixed. No ambient Fd-3m diamond CIF with coordinates in the COD: inconclusive." . "0.95"^^ . . "supports" . "If diamond's carbon atoms lie on two interpenetrating face-centred cubic lattices with tetrahedral coordination, a refined diamond structure gives every carbon exactly four nearest neighbours at a sqrt(3)/4 with all six bond angles 109.47 degrees." . "Symmetry expansion of the first COD diamond CIF (by id) in Fd-3m that yields 8 full-occupancy carbons per cell; neighbours within 1.1 times the shortest C-C distance counted and bond angles computed in a 3x3x3 block." . "From the atomic coordinates of a COD diamond CIF (formula C, space group F d -3 m, Z = 8, ambient), expanding symmetry to a 3x3x3 block: every carbon has exactly 4 neighbours within 1.1 times the shortest C-C distance, that distance equals a sqrt(3)/4 within 0.1 per cent, and every bond angle is within 0.1 degree of 109.47: supports." . "true"^^ . . "" . "CC0 (COD data are public domain)" . . "Dataset: Crystallography Open Database (COD) search API and CIF files" . . . . "sha256:8a3cd9baa420d634b1aa242c843e45510abdacedd16d607d1f956db997b2ef99" . "sha256:8ac7ddff65131f7f940a5d94f598f93012a152495b3f154b4c9ed536412af8ea" . . "delphisci claim tester (claude-fable-5.1; crystals-and-form-tests-1)" . . . "claude-fable-5.1" . . . . . . . . . "2026-11-08T16:24:31.804Z"^^ . . . . . "Claim test of bragg1915-03: supports, confidence 0.95" . . "RSA" . "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAyFHtPB6p0mCjDozxlOY9CmO3nBm7Te3jFbXyLmM+G1tGe47Da0jYIbhkl9Oo1ZjxmCa3LCwlEqK8gj6hEIcL4ahW30JXh9HycfKVk1bugkzMEV15tJdTzAU3sGMFnbNsn43xY2LFLy45tApkRm5byEiM7oRRrooIdwoQKnP4Wzq/bfAoJ9qvW+MGkelyOTd1jbSt+KfmT7xKmDfWzAHddUlWwMX2QJOLxDaffOteTop6ZRgPiNmPJKA/S62Gac9XtSYT3oDkZ6/nr5cxxNLpOyxTf5FPISiCe11xYO/unYjY+mwnOfA8yhJIyx1l0O9I0vpOpn+E5TvyHJV+oSTrvwIDAQAB" . "dyYQqN9lkUe/YLaVfbimM6yOlUtaafjTjKh9Bws5lnHX1VSNapt8Ez6ZO4JqbqtLyntvap8t4ziZl0Iei7yYaESYjNcOLljW7TrFGrDH3h8PTwi/KZYi0N7BOuxHXMri+N+sNcSTz+gB+Yi3Z8x7TcVDrRZK+8QKdmkaDl/5MWE7jFqvFyd/893sfp7OY8d1m7+z0TjEXDRYHNje6iNuvrJFj4Uwl+JXpzLy6t4VNrPAH2HVcRK41ZUwjFabySoDZ++z/P8L3fsQmJSPmtb2yCw0h+dUrvjnCVNRRb0u60GUx7FDOHPkP718yEEoIcXrrB2MHfZjFEPFb6K62U33iQ==" . . .