| U test | DE5B5E8SCA | definition | open | Wikipedia List of statistics articles#UH6H |
| U-category | EEF4VEJ4BG | definition | open | Wikipedia Glossary of category theory#OEH0 |
| U-chart | AFR0ZFTZQV | definition | open | Wikipedia List of statistics articles#PTBN |
| U-chart | DKT57E9FKN | definition | open | Wikipedia U-chart, Wikidata Q7862937 |
| U-duality | 38RX85JBW6 | unknown | open | Wikipedia List of string theory topics#UL0D |
| U-duality | RR09BM3F8Z | unknown | open | Wikidata Q4001392, nLab U-duality |
| U-invariant | VW2K88CKYP | definition | open | Wikipedia U-invariant, Wikidata Q7862939 |
| U-Prove | 6AZMZ1DC49 | definition | open | Wikipedia U-Prove, Wikidata Q7862918 |
| U-quadratic distribution | 9S4A3Q4WE6 | definition | open | Wikipedia List of probability distributions#WRCK |
| U-quadratic distribution | BDE19TX4FQ | definition | open | Wikipedia List of statistics articles#L6OD |
| U-quadratic distribution | ZPH4YNJRGM | definition | open | Wikipedia U-quadratic distribution, Wikidata Q3258567 |
| U-rank | MPY70SR01H | definition | open | Wikipedia U-rank, Wikidata Q7862947 |
| U-shaped certification tradeoff | DF4MCXFNN8 | 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 2610.21139#MVJ0 |
| U-statistic | Q393Z4MN0R | definition | open | Wikipedia List of statistics articles#JMYK |
| U-statistic | VHGSCR4CD0 | definition | open | Wikidata Q7862949, MathWorld U-Statistic, Wikipedia U-statistic |
| U. K. Anandavardhanan | HWJPM6NRDT | topic | open | Wikipedia U. K. Anandavardhanan, Wikidata Q105085591 |
| U. Narayan Bhat | FNGDT4V2QY | topic | open | Wikipedia List of fellows of the American Statistical Association#6RBX |
| U. Narayan Bhat | ZJ4M5CAG7B | topic | open | Wikipedia U. Narayan Bhat, Wikidata Q7863527 |
| U. S. R. Murty | 7VSVXH6QB4 | unknown | open | Wikipedia List of Indian mathematicians#UGEI |
| U/u | Y2TERR74CB | unknown | out_of_scope (a notation: the notation register holds it (corpus spec K10.4)) | Wikidata Q9747, ProofWiki Symbols:U |
| U75 | NGHPW0R3Y2 | object | open | Wikipedia List of uniform polyhedra by Schwarz triangle#0U0K |
| U75 | QSKG14RMA2 | object | open | Wikipedia List of uniform tilings on the sphere, plane, and hyperbolic plane#OQTK |
| UA | A1BW02H2DR | 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 2610.19088#4QDH |
| UA | MZFPDNCS6R | 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 2610.19088#L2XK |
| Uban number | PHE8D4P950 | object | open | Wikidata Q120336340, MathWorld UbanNumber, OEIS A089590 |
| Ubiratan D'Ambrosio | 1QE8037Z3D | topic | open | Wikipedia Ubiratan D'Ambrosio, Wikidata Q2472797 |
| Ubol Ratana | P662HBK77N | unknown | open | Wikipedia List of University of California, Los Angeles people#K04Y |
| UBU grid regularization | RQ0Z6XZ2JA | 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 2609.28611#09PB |
| UBU local error and moments | Y71SDSNZCC | 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 2609.28611#9N19 |
| Uchquduq | Q0EHV1SY2Q | unknown | open | Wikipedia List of places with numeric names#HRCI |
| UCL Faculty of Mathematical and Physical Sciences | 8XHN57JZRN | definition | open | Wikipedia UCL Faculty of Mathematical and Physical Sciences, Wikidata Q7864070 |
| UComms | S71XKHZPC2 | unknown | open | Wikipedia List of polling organizations#FEGA |
| UCP in energy spaces $H^r(\R^n)$ | V1R2XA82MN | 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 2610.17524#ZHT3 |
| UCP of fractional Laplacian for $L_s$-functions | KT3985P46Y | 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 2610.17524#QAVT |
| UCPH Department of Mathematical Sciences | G0H9B7CV03 | definition | open | Wikipedia UCPH Department of Mathematical Sciences, Wikidata Q7895310 |
| UCSMP (University of Chicago School Mathematics Project) axioms | RVHV6XFRGP | statement | open | Wikipedia Foundations of geometry#LF2E |
| UCT Mathematics Competition | FR3K5MYJJZ | definition | open | Wikipedia UCT Mathematics Competition, Wikidata Q7864134 |
| Udayadivākara | R3BK27WW6Q | topic | open | Wikipedia Udayadivākara, Wikidata Q127922749 |
| Udayana | E8YGHBA4ZA | topic | open | Wikipedia List of logicians#YOBS |
| Udayana | ND64WEPP70 | topic | open | Wikipedia Udayana, Wikidata Q3633956 |
| Udayana | X6EAJQBTAS | topic | open | Wikipedia List of teachers of Nyaya#ROGQ |
| Udi Manber | J73JAHNTFM | unknown | open | Wikipedia List of people by Erdős number#E6BE |
| Udwadia–Kalaba formulation | 652SB5DJQW | definition | open | Wikipedia Udwadia–Kalaba formulation, Wikidata Q5508956 |
| Udyotakara | KTX4CVPZ1Z | unknown | open | Wikipedia List of logicians#WE9L |
| Udyotakara | WY5587GJP3 | unknown | open | Wikipedia List of teachers of Nyaya#QTM0 |
| ueberschiebung | M5EZ78TTM9 | definition | open | Wikipedia Glossary of invariant theory#9Y6V |
| UEFA Champions League | V2W64NMFDS | unknown | open | Wikipedia List of Borussia Dortmund records and statistics#BUF9 |
| UEFA Cup | G0SX8M3YCF | unknown | open | Wikipedia List of Borussia Dortmund records and statistics#4QJP |
| UEFA Super Cup | 560KQ8ZJZP | unknown | open | Wikipedia List of Borussia Dortmund records and statistics#MXWW |
| Ueli Maurer | 63XD4QQJSP | topic | open | Wikipedia Ueli Maurer (cryptographer), Wikidata Q120462 |
| Ueli Maurer | 9VJVX6F3M8 | topic | open | Wikipedia List of people by Erdős number#WSFX |
| UES | SH0GFDV4G5 | definition | open | Wikipedia UES (cipher), Wikidata Q7864434 |
| UFD | 3P7194Y2JV | concept | open | lebl_scv index/6.4/ufd |
| UFD | 8VV8ANW1P6 | definition | open | Wikipedia Glossary of commutative algebra#YAS6 |
| UFD | R1V6RJM7GX | concept | open | lebl_scv index/D/ufd |
| Uffe Haagerup | 63TNYGASN2 | topic | open | Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#AR1G, Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#L5N8 |
| Uffe Haagerup | SJAW0VKH5E | topic | open | Wikipedia Uffe Haagerup, Wikidata Q1510753 |
| UFO | 189V48NJA8 | 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 2610.12817#RDZT |
| UFRGS Famous Alumni | WGQYQ5HNMN | unknown | open | Wikipedia Federal University of Rio Grande do Sul#2D5S |
| Ugly duckling theorem | HZVHQT5EES | statement | open | mathlib_1000 Q2473965, Wikidata Q2473965, thousand_plus Q2473965, Wikipedia Ugly duckling theorem |
| Ugly duckling theorem | ZD6V3ACDYV | statement | open | Wikipedia List of theorems#IHE0 |
| Ugo Amaldi | E3XK7M9TWC | topic | open | Wikipedia List of Italian mathematicians#RMDI |
| Ugo Amaldi | XWZVYSFNPS | topic | open | Wikipedia Ugo Amaldi (mathematician), Wikidata Q982393 |
| Ugo Broggi | 9TT36NBJXR | topic | open | Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#ZW85 |
| Ugo Broggi | X4PYMY8F2C | topic | open | Wikipedia Ugo Broggi, Wikidata Q4002852 |
| Ugo Dal Lago | G8QAE04V6K | unknown | out_of_scope (a person, not an item of mathematics) | Wikidata Q93944804, nLab Ugo Dal Lago |
| Ugo Morin | NE1YXCCGYV | topic | open | Wikipedia Ugo Morin, Wikidata Q672372 |
| Ugo Morin | S7XE94YC1W | topic | open | Wikipedia List of Italian mathematicians#UMBY |
| Uhlenbeck's compactness theorem | BEYX8DG7C5 | statement | open | Wikipedia Uhlenbeck's compactness theorem, Wikidata Q135397856 |
| Uhlenbeck's strong compactness theorem | MJ4QH1RTPA | statement | open | Wikipedia Uhlenbeck's compactness theorem#6LIB |
| Uhlenbeck's weak compactness theorem | 102EK5TWTT | statement | open | Wikipedia Uhlenbeck's compactness theorem#TMYF |
| Uhlenbeck; see also Epstein | NM052GM5ZV | 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 2609.35858#HLWI |
| Uhlmann | 648M7XCN76 | 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 2610.16267#YBKG |
| Uhlmann's majorisation theorem | CSQA8MPK3C | 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 2609.40355#WLCS |
| Uhlmann's theorem | MRCMH9Q4N9 | statement | open | Wikipedia Fidelity of quantum states#W0WL |
| UK Data Archive | ZMPT9GPENY | definition | open | Wikipedia UK Data Archive, Wikidata Q17039301 |
| UK Data Service | 47QQ8SXSYH | definition | open | Wikipedia UK Data Service, Wikidata Q17513757 |
| UK Molecular R-matrix Codes | EG0B0QG8H6 | definition | open | Wikipedia UK Molecular R-matrix Codes, Wikidata Q30673623 |
| UK Statistics Authority | 8YMSBK0V9T | definition | open | Wikipedia UK Statistics Authority, Wikidata Q14592116 |
| Ukkonen's algorithm | Q4B3FNP373 | unknown | open | Wikipedia List of algorithms#GMY5 |
| Ukraine | 460DA37J2A | unknown | out_of_scope (a person, not an item of mathematics) | Wikidata Q212, ProofWiki Mathematician:Mathematicians/Sorted_By_Nation/Ukraine |
| Ulam | QCYAMXDMYD | definition | open | Wikipedia Glossary of set theory#D4Y7 |
| Ulam | WK3V73W7SF | definition | open | Wikipedia Glossary of real and complex analysis#9XUF |
| Ulam matrix | C6FSXB320X | definition | open | Wikipedia Ulam matrix, Wikidata Q18394939 |
| Ulam number | 9S6B55PNRW | definition | open | Wikipedia List of unsolved problems in mathematics#X071 |
| Ulam number | KYHY6BX74S | concept | open | Wikidata Q1784026, MathWorld UlamSequence, Wikipedia Ulam number |
| Ulam spiral | 6SE04FDEAC | definition | open | Wikipedia List of recreational number theory topics#7VQ3 |
| Ulam spiral | 7AYVNHTMH8 | concept | open | Wikidata Q842172, MathWorld PrimeSpiral, OEIS A143856, Wikipedia Ulam spiral |
| Ulam's game | QP4J1SHYMW | definition | open | Wikipedia Ulam's game, Wikidata Q7878704 |
| Ulam's packing conjecture | EXD6QYTM0H | conjecture | open | Wikipedia List of unsolved problems in mathematics#2VP8 |
| Ulam's packing conjecture | NC2AB15CEJ | conjecture | open | Wikipedia Ulam's packing conjecture, Wikidata Q18356153 |
| ULC Measures on \(\bb N\ | 33CT5RKX9D | example | 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 2609.23994#31H8 |
| ULC Measures on \(\bb N\ | R0VG8W244C | example | 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 2609.23994#MJWT |
| ULD restart and smoothing | 114JTYNE1N | 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 2609.28611#WLY7 |
| Ulf Grenander | 3J851TNYJ9 | topic | open | Wikipedia List of people by Erdős number#WGP8, Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#10YR, Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#12XW |
| Ulf Grenander | HM1MJBTXP4 | topic | open | Wikipedia Ulf Grenander, Wikidata Q3566428 |
| Ulf Lindström | 1MQE7FMTGC | unknown | out_of_scope (a person, not an item of mathematics) | Wikidata Q7878891, nLab Ulf Lindström |
| Uli Wagner | 1J3NG4Y7FA | unknown | out_of_scope (a person, not an item of mathematics) | Wikidata Q57637964, nLab Uli Wagner |
| Ulisse Dini | ACZNVGDMQ8 | unknown | open | Wikipedia List of Italian mathematicians#YNSZ, Wikipedia List of mathematicians born in the 19th century#OP6D |
| Ulisse Dini | DMQ56D67VV | unknown | open | Wikipedia List of Italian mathematicians#MO1Y |