| upper domination number | 7NFNBQG9R2 | unknown | open | Wikidata Q130405721, MathWorld UpperDominationNumber |
| Upper endpoint | KX2CEPPH8C | statement | record (an item of a paper that no node asks for yet. The record keeps its edges in the record plane (corpus arxiv AX8.6)) | arXiv 2610.08568#17FE |
| Upper estimate | VPM98MYNN0 | statement | record (an item of a paper that no node asks for yet. The record keeps its edges in the record plane (corpus arxiv AX8.6)) | arXiv 2609.23230#FBL1 |
| upper estimate for the kernel ratio | NQDRZN56G7 | statement | record (an item of a paper that no node asks for yet. The record keeps its edges in the record plane (corpus arxiv AX8.6)) | arXiv 2609.26134#J1UR |
| upper half-plane | FJF15JH537 | definition | open | Wikidata Q3258885, LMFDB knowl mf.upper_half_plane, MathWorld UpperHalf-Plane, nLab upper half-plane, Wikipedia Upper half-plane |
| upper irredundance number | PNW372RZMS | unknown | open | Wikidata Q130486997, MathWorld UpperIrredundanceNumber |
| Upper leading-edge barrier | VV7RZBERVK | statement | record (an item of a paper that no node asks for yet. The record keeps its edges in the record plane (corpus arxiv AX8.6)) | arXiv 2609.33805#K7C0 |
| Upper Nine Mile River, Nova Scotia | FFX63R26TN | unknown | open | Wikipedia List of places with numeric names#8TIZ |
| Upper reflected BSDE | VAWJRETPBM | definition | record (an item of a paper that no node asks for yet. The record keeps its edges in the record plane (corpus arxiv AX8.6)) | arXiv 2609.23768#3W3U |
| Upper semi-continuity of $\gamma$ | V7Y7868VE1 | statement | record (an item of a paper that no node asks for yet. The record keeps its edges in the record plane (corpus arxiv AX8.6)) | arXiv 2609.21985#V0C9 |
| Upper semicontinuity of algebraic dimension | T74GANMHAN | statement | record (an item of a paper that no node asks for yet. The record keeps its edges in the record plane (corpus arxiv AX8.6)) | arXiv 2407.02022#7N6S |
| Upper semicontinuity of the distance function | HARM6BFXGV | statement | record (an item of a paper that no node asks for yet. The record keeps its edges in the record plane (corpus arxiv AX8.6)) | arXiv 2610.15460#FHKE |
| Upper semicontinuity under polyhedral approximation | D6CYGTSJ34 | statement | record (an item of a paper that no node asks for yet. The record keeps its edges in the record plane (corpus arxiv AX8.6)) | arXiv 2609.21670#90T5 |
| Upper set | F4KWFJETVY | definition | open | Wikipedia List of order theory topics#FWNK |
| upper set | VPPP3A9W66 | definition | open | Wikidata Q2528262, nLab upper set, Wikipedia Upper and lower sets |
| Upper stationary-flow truncation energy | MSQA1XMTJY | statement | record (an item of a paper that no node asks for yet. The record keeps its edges in the record plane (corpus arxiv AX8.6)) | arXiv 2610.09030#Q9UA |
| Upper topology | JZ85RP18CY | definition | open | Wikipedia Upper topology, Wikidata Q7899053 |
| Upper topology | XZ9VPDXGJF | definition | open | Wikipedia List of order theory topics#BZWP, Wikipedia List of general topology topics#BH2S |
| upper triangular matrix | 1W8C1QV0S3 | unknown | node (a node has the same name as the row) | Wikidata Q77968835, MathWorld UpperTriangularMatrix |
| upper triangular matrix | 6G82VYGQY8 | concept | open | austin_ula index/3.1.4/upper-triangular-matrix |
| Upper weak submodularity | 3Q6E9J25JQ | definition | record (an item of a paper that no node asks for yet. The record keeps its edges in the record plane (corpus arxiv AX8.6)) | arXiv 2609.24569#H641 |
| Upper {Hausdorff dimension} estimate | FG1QYDTVMP | statement | record (an item of a paper that no node asks for yet. The record keeps its edges in the record plane (corpus arxiv AX8.6)) | arXiv 2609.36412#89A1 |
| Upper-antidiagonal attack criterion | 5SVBP59R3S | statement | record (an item of a paper that no node asks for yet. The record keeps its edges in the record plane (corpus arxiv AX8.6)) | arXiv 2609.31336#K10R |
| Upper-bound | EKK9D07N7P | statement | record (an item of a paper that no node asks for yet. The record keeps its edges in the record plane (corpus arxiv AX8.6)) | arXiv 2610.21781#RVNL |
| Upper-bound | YRENSSY7SQ | statement | record (an item of a paper that no node asks for yet. The record keeps its edges in the record plane (corpus arxiv AX8.6)) | arXiv 2610.21781#G2FT |
| Upper-bound density | RYDRB7FX6V | statement | record (an item of a paper that no node asks for yet. The record keeps its edges in the record plane (corpus arxiv AX8.6)) | arXiv 2610.21781#KY0H |
| Upper-bound invariance | HZT7G4TE98 | statement | record (an item of a paper that no node asks for yet. The record keeps its edges in the record plane (corpus arxiv AX8.6)) | arXiv 2610.17441#IAYM |
| Upper-convected Maxwell model | NZ8RDJD107 | definition | open | Wikipedia Upper-convected Maxwell model, Wikidata Q3318079 |
| Upper-convected time derivative | DJQC72BQX1 | definition | open | Wikipedia Upper-convected time derivative, Wikidata Q7898446 |
| Upper-degree slice of a nonbottom interval | PD0794YH7D | statement | record (an item of a paper that no node asks for yet. The record keeps its edges in the record plane (corpus arxiv AX8.6)) | arXiv 2609.24541#ZQB9 |
| Upper-quantile submeasure | AXXQPNJG14 | statement | record (an item of a paper that no node asks for yet. The record keeps its edges in the record plane (corpus arxiv AX8.6)) | arXiv 2609.38228#4BE9 |
| Upper-row counting formula | ZS81YM7DJ6 | statement | record (an item of a paper that no node asks for yet. The record keeps its edges in the record plane (corpus arxiv AX8.6)) | arXiv 2609.31336#E4QA |
| Upperthird | 6P0D3J3VC0 | unknown | open | Wikipedia List of places with numeric names#IBSH |
| UpSet plot | X12FFN1P22 | definition | open | Wikipedia UpSet plot, Wikidata Q113127597 |
| Upside potential ratio | 9Q22BD0905 | definition | open | Wikipedia List of statistics articles#MKE9 |
| Upside potential ratio | BAJWX7SNP8 | definition | open | Wikipedia Upside potential ratio, Wikidata Q7899278 |
| upstairs, downstairs | AFHA87M5YE | definition | open | Wikipedia Glossary of mathematical jargon#Q31Y |
| Upstream expansion rate estimate for $\mathrm{md}^{-\delta} \circ F$ | QMREXPHCD4 | statement | record (an item of a paper that no node asks for yet. The record keeps its edges in the record plane (corpus arxiv AX8.6)) | arXiv 2610.10051#A66B |
| upward Löwenheim–Skolem theorem | KN4Y2Y9XQY | definition | open | Wikipedia Glossary of set theory#P77M |
| Upward Löwenheim–Skolem theorem | XD1QF66R0Q | statement | open | Wikipedia Compactness theorem#PGNU |
| upward Löwenheim–Skolem theorem | YKY3D8JJWY | definition | open | Wikipedia Glossary of logic#UQYH |
| Upward planar drawing | MR989MK6ZK | definition | open | Wikipedia Upward planar drawing, Wikidata Q17090789 |
| Upward) $\kappa$-Spectral Curvature | ZJ4N2XGA6T | definition | record (an item of a paper that no node asks for yet. The record keeps its edges in the record plane (corpus arxiv AX8.6)) | arXiv 2610.06724#6NDI |
| Upwind scheme | BB20JFK7HP | definition | open | Wikipedia Upwind scheme, Wikidata Q7899499 |
| uranium | AWFYN1K7T5 | definition | open | Wikidata Q1098, ProofWiki Definition:Uranium |
| uranium-238 | WVJN70G8JP | definition | open | Wikidata Q1148503, ProofWiki Definition:Uranium/238 |
| Uranus | ZG0MTQSEM7 | definition | open | Wikidata Q324, ProofWiki Definition:Uranus |
| Urbain Le Verrier | NBHF8TVGAK | topic | open | Wikipedia Urbain Le Verrier, Wikidata Q104154 |
| Urban Ecology Institute | 2MZHNGA1H5 | unknown | open | Wikipedia List of research centers at Boston College#N6E2 |
| Urban scaling | 9ENS7W7MFJ | definition | open | Wikipedia Urban scaling, Wikidata Q20827351 |
| Urban wage premium | 9SC4SK1JMP | unknown | open | Wikipedia Urban scaling#VN1T |
| Urbanization in Turkey | ETQTDMNDW2 | unknown | open | Wikipedia Demographics of Turkey#XL4I |
| Urchin | WVAW6KRAG1 | definition | open | Wikipedia Urchin (software), Wikidata Q1914164 |
| urelement | 4DRPCTKHQB | definition | open | Wikidata Q1896657, MathWorld Urelement, nLab urelement, Wikipedia Urelement |
| urelement | 8TZTZDKYZD | definition | open | Wikipedia Glossary of set theory#WTYW |
| Urey–Bigeleisen–Mayer equation | SQDXN4SFHB | definition | open | Wikipedia Urey–Bigeleisen–Mayer equation, Wikidata Q115918001 |
| Uri Zwick | XAH2G3MZBM | unknown | open | Wikipedia List of people by Erdős number#FKTV |
| Uriah Fuller | 1Q0R8BN4VE | unknown | open | Wikipedia Martin Gardner#PR4O |
| Uriel Feige | 2B41J6KB51 | topic | open | Wikipedia Uriel Feige, Wikidata Q92817 |
| Uriel Feige | S275N86CGC | topic | open | Wikipedia List of people by Erdős number#OPSO, Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#24E0 |
| Uriel Frisch | FPGAY0CR92 | unknown | open | Wikipedia List of Jewish mathematicians#VF2E |
| Uriel Frisch | H6ZRSAGP9T | unknown | open | Wikipedia List of people by Erdős number#46I6 |
| Uriel Rothblum | R6Q3JNNV0Q | topic | open | Wikipedia Uriel Rothblum, Wikidata Q28777453 |
| Uriel Rothblum | VAY9WJ0JFY | topic | open | Wikipedia List of Jewish mathematicians#9BVR |
| Urine is not sterile | EZS9KFN2Z7 | unknown | open | Wikipedia List of common misconceptions about science, technology, and mathematics#7VG5 |
| Urmila Mahadev | RQB9TF8J75 | topic | open | Wikipedia Urmila Mahadev, Wikidata Q99485343 |
| urn problem | A1FHD0K17C | problem | open | Wikidata Q36938, MathWorld BallPicking, Wikipedia Urn problem |
| Urn problem | MSE0WY6E0H | problem | open | Wikipedia List of probability topics#5NIO |
| Urn problem | ZE5XCQDB4G | problem | open | Wikipedia List of statistics articles#FCVQ |
| URP lower bound and URP/COS equality | RA9R6NRKGN | statement | record (an item of a paper that no node asks for yet. The record keeps its edges in the record plane (corpus arxiv AX8.6)) | arXiv 2610.11143#M03V |
| UrQMD | 6GNDQ9EDXG | unknown | open | Wikipedia List of open-source software for mathematics#DMI4 |
| Urquhart graph | TQRY79EFMT | definition | open | Wikipedia Urquhart graph, Wikidata Q2811423 |
| Urquhart's theorem | X1PRE82P01 | statement | open | Wikipedia Ex-tangential quadrilateral#JFKY |
| Urs Schreiber | DQGTF4YFMX | topic | out_of_scope (a person, not an item of mathematics) | Wikidata Q16875354, nLab Urs Schreiber, Wikipedia Urs Schreiber |
| Urs Stammbach | 14E7A0B2GA | topic | open | Wikipedia Urs Stammbach, Wikidata Q1541587 |
| Ursell function | EXXN9GC6PA | definition | open | Wikipedia Ursell function, Wikidata Q7901160 |
| Ursell function | N222PH06DF | definition | open | Wikipedia List of statistics articles#0Q1T |
| Ursescu theorem | K9TPJTSSW1 | statement | open | Wikipedia Ursescu theorem, Wikidata Q96413064 |
| Ursescu theorem | NQVAJZTA1R | statement | open | Wikipedia Ursescu theorem#EJL2 |
| Ursula Hamenstädt | 692SDGYR9X | topic | open | Wikipedia Ursula Hamenstädt, Wikidata Q1296815 |
| Ursula Hamenstädt | FRFKF8H6EE | topic | open | Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#TIDX, Wikipedia List of German mathematicians#FHLA |
| Ursula Martin | A7XPGYSSTM | unknown | open | Wikipedia List of women logicians#8BKJ |
| Ursula van Rienen | 9ZXFJ8VAHM | topic | open | Wikipedia Ursula van Rienen, Wikidata Q21264826 |
| Urszula Alicja Foryś | RNQB2T6X3K | topic | open | Wikipedia Urszula Alicja Foryś, Wikidata Q103037764 |
| Urtzi Buijs | ES2FJW5TGJ | unknown | out_of_scope (a person, not an item of mathematics) | Wikidata Q102292256, nLab Urtzi Buijs |
| Uruguay | 754ZZV1DE1 | unknown | out_of_scope (a person, not an item of mathematics) | Wikidata Q77, ProofWiki Mathematician:Mathematicians/Sorted_By_Nation/Uruguay |
| Urysohn space | JYJ15AS7ED | concept | open | Wikidata Q1629844, ProofWiki Definition:Completely_Hausdorff_Space |
| Urysohn universal space | HHYX3A1DP6 | definition | open | Wikipedia Urysohn universal space, Wikidata Q7901611 |
| Urysohn's lemma | 9WSFAS4Q12 | statement | node (a node has the same Wikidata item as the row) | mathlib_overview Topology > General topology > Urysohn's lemma, Mathlib exists_continuous_zero_one_of_isClosed, Wikidata Q1816967, EoM Urysohn_lemma, MathWorld UrysohnsLemma, nLab Urysohn's lemma, Wikipedia Urysohn's lemma |
| Urysohn's lemma | K1C31F1D9B | statement | open | Wikipedia List of mathematical proofs#7S1B, Wikipedia List of general topology topics#3A76, Wikipedia List of lemmas#IERB |
| Urysohn, Pavlo Samuilovich | P64KZNN0DS | topic | open | Wikipedia List of Ukrainian mathematicians#O910 |
| US jobs report | VGMPBNGY56 | unknown | open | Wikipedia Bureau of Labor Statistics#VY1O |
| US Navy Bombe | HCE4SD0GW8 | unknown | open | Wikipedia Bombe#1T2L |
| Usage of the lemma | 695MFVS3B8 | statement | open | Wikipedia Pumping lemma for context-free languages#EUA7 |
| USD1 | E690SV6BAK | unknown | open | Wikipedia World Liberty Financial#YEQ3 |
| Use | 15G1ANCCFC | example | open | Wikipedia Interquartile range#YL6F |
| Use | 16MPZ36241 | example | open | Wikipedia Galois/Counter Mode#GGB0 |
| Use | 1NKQ6NRVKQ | example | open | Wikipedia Ground field#LT8I |
| Use | 2NB2RWATS1 | example | open | Wikipedia S-matrix#N3ZY |
| Use | 385MKMN0N3 | example | open | Wikipedia Body-part counting system#4AI4 |