Source notes for Problem 940

../

beyer_de_ryke_2026_density_deficit_cube_full_sums: Source notes for Problem 940: Beyer de Ryke: A density deficit for sums of three cube-full numbers.

browning_heath_brown_2018_counting_rational_points_quadric_surfaces: Source notes for Problem 940: Browning–Heath-Brown: Counting rational points on quadric surfaces.

browning_munshi_wang_2026_beyond_square_root_barrier_cubic_forms_perazzo_type: Source notes for Problem 940: Browning–Munshi–Wang: Beyond the square-root barrier: cubic forms of Perazzo type.

browning_verzobio_2026_sums_three_powerful_numbers: Source notes for Problem 940: Browning–Verzobio: Sums of three powerful numbers.

colliot_thelene_skorobogatov_2021_brauer_groups_schemes: Source notes for Problem 940: Colliot-Thélène–Skorobogatov: Brauer groups of schemes.

colliot_thelene_skorobogatov_2021_comparing_two_brauer_groups_ii: Source notes for Problem 940: Colliot-Thélène–Skorobogatov: Comparing the two Brauer groups, II.

elman_karpenko_merkurjev_2008_algebraic_geometric_theory_quadratic_forms: Source notes for Problem 940: Elman–Karpenko–Merkurjev: Chapters 17–18 of The Algebraic and Geometric Theory of Quadratic Forms.

ghidelli_2019_arbitrarily_long_gaps_between_values_positive_definite_cubic_biquadratic_diagonal_forms: Source notes for Problem 940: Ghidelli: Arbitrarily long gaps between the values of positive-definite cubic and biquadratic diagonal forms.

heath_brown_1997_density_rational_points_cubic_surfaces: Source notes for Problem 940: Heath-Brown: The density of rational points on cubic surfaces.

voight_2021_quaternion_algebras_over_global_fields: Source notes for Problem 940: Voight: Quaternion algebras over global fields.

wang_2021_sums_cubes_ratios_conjectures: Source notes for Problem 940: Wang: Sums of cubes and the Ratios Conjectures.

---

These notes summarize sources used in the research. Consult the canonical library records where linked for retained reading copies and bibliographic details.