| University of New Hampshire | 9NPYJ511JW | unknown | open | Wikipedia List of polling organizations#UEOD |
| University of Singapore (1962-1980) | 71QJJDXAC1 | unknown | open | Wikipedia National University of Singapore#VDGH |
| University of South Carolina | 2WBD0KTKSF | unknown | open | Wikipedia List of United States regional mathematics competitions#Y6TX |
| University of Sydney School of Mathematics and Statistics | V85AZXTA1G | definition | open | Wikipedia University of Sydney School of Mathematics and Statistics, Wikidata Q15995514 |
| University of Waterloo Faculty of Mathematics | 3F4T9MMDXJ | topic | open | Wikipedia University of Waterloo Faculty of Mathematics, Wikidata Q7896591 |
| University of Wolverhampton | DEJQ2N8EBF | unknown | open | Wikipedia List of things named after Alan Turing#VY4S |
| University Park | E0HCGKGE90 | unknown | open | Wikipedia List of U.S. communities with Hispanic-majority populations in the 2000 census#VRZE |
| University Ranking by Academic Performance | 31BXVKR1YD | definition | open | Wikipedia University Ranking by Academic Performance, Wikidata Q6103393 |
| University Statisticians of the Southern Experiment Stations | EQHXGDK583 | definition | open | Wikipedia List of academic statistical associations#EXVL |
| University Statisticians of the Southern Experiment Stations | Z23WF4GK4Z | definition | open | Wikipedia University Statisticians of the Southern Experiment Stations, Wikidata Q7894944 |
| Unix-like | DQE75R8TD6 | unknown | open | Wikipedia List of random number generators#3R5P |
| Unión Matemática de América Latina y el Caribe | 1GAFC38D0K | unknown | open | Wikipedia List of mathematical societies#57T6 |
| unknot | CZ4PZSG5CN | definition | open | Wikidata Q1188344, MathWorld Unknot, nLab unknot, Wikipedia Unknot |
| Unknot | FVASF79MWP | definition | open | Wikipedia List of mathematical knots and links#YZEC |
| Unknot | YS9NWCWAQC | definition | open | Wikipedia List of topologies#OI9G |
| unknots | SM5Z78MBY9 | 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 2610.18803#PILN |
| Unknotting number | A6D1D4G3J4 | 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 2610.10206#DPYO |
| unknotting number | QCM0RAAED5 | definition | open | Wikidata Q7896949, MathWorld UnknottingNumber, nLab unknotting number, Wikipedia Unknotting number |
| Unknotting number | TY0BCR03HC | definition | open | Wikipedia List of knot theory topics#1IXO |
| Unknotting number of positive torus links | 7RR2SJBQES | 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 2610.10206#C3ZA |
| Unknotting number of simply-linked links | TTAJXCWEQE | 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 2610.10206#DDLJ |
| Unknotting problem | 31M5V11BTH | conjecture | open | Wikipedia Unknotting problem, Wikidata Q7896950 |
| Unknotting problem | NDEZE3Q0B9 | conjecture | open | Wikipedia List of knot theory topics#CQDY |
| Unknotting problem | RK64M9ABV4 | conjecture | open | Wikipedia List of unsolved problems in mathematics#K6YD |
| Unknown key-share attack | 4VBBR48YQA | definition | open | Wikipedia Unknown key-share attack, Wikidata Q7896987 |
| Unknown nonsmooth regularity | 8CP12BYXCN | 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 2610.15202#NT8O |
| Unknown population smoothness | 1NT4QG12VP | 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 2610.15202#XL2Y |
| Unknown variance and original distance | 1HYV67PQW5 | 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 2610.15202#8IQI |
| Unknown-drift adaptation over joint memories | MAR44KBQ0G | 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 2610.15543#X67I |
| Unknown-spectrum cloner fidelity and compact-set optimum | ECWCP0QMVC | 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 2609.35986#P9U8 |
| Unlabeled coloring | AYPF4KWHST | unknown | open | Wikipedia Graph coloring#NTBY |
| unlabeled sensing and real phase retrieval | 1J4YQJRGF6 | 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 2006.05158#QCBK |
| Unlikely intersection | A0GBZ17NPG | definition | open | Wikipedia Glossary of arithmetic and diophantine geometry#0B9L |
| unlink | 61ASXBN62B | definition | open | Wikidata Q2791199, MathWorld Unlink, Wikipedia Unlink |
| Unlink | CAW1BC5HSM | definition | open | Wikipedia List of mathematical knots and links#12T2 |
| Unlink | QRGP49ZQKM | definition | open | Wikipedia List of knot theory topics#JNZW |
| Unmatched count | D1EWJTQ35J | definition | open | Wikipedia List of statistics articles#31FX |
| Unmatched count | WZ1NGMEP18 | definition | open | Wikipedia Unmatched count, Wikidata Q1588400 |
| Unmatched-sink regimes | Q7H7R8VC04 | 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 2609.25039#5LUZ |
| unmixed | 8V23JB02FY | definition | open | Wikipedia Glossary of commutative algebra#5ADC |
| Unmixedness theorem | GJ3G4CPWJN | definition | open | Wikipedia List of theorems#FVOD |
| Unnatural isomorphism | ZPZK06Q6F0 | unknown | open | Wikipedia Natural transformation#K0II |
| Unnormalized randomized STORM | F5ZES2BZ8P | 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 2610.13789#QIR1 |
| Unobserved heterogeneity in duration models | 8XZYC719QX | definition | open | Wikipedia Unobserved heterogeneity in duration models, Wikidata Q25304402 |
| unode | Z3BPCRTFRD | definition | open | Wikipedia Glossary of classical algebraic geometry#ATUL |
| Unordered DPP descent datum | 33521ZXTJG | 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 2609.27799#4S4X |
| unordered pair | 2ASXAGRNQ9 | definition | open | Wikipedia Glossary of set theory#8BSF |
| unordered pair | 8RTB58KFDP | definition | open | Wikidata Q1477744, MathWorld Pair, nLab unordered pair, Wikipedia Unordered pair |
| Unoriented cobordism | R2BGD8F4Y6 | unknown | open | Wikipedia Cobordism#TUQ2 |
| Unoriented cobordism ring | Q8ACNE0QB3 | unknown | open | Wikipedia List of cohomology theories#1AZH |
| Unoriented tangloid category | DMPEWV7KQK | 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 2609.37524#KRJ0 |
| Unpredictable permutation | MNXJ9MQTAJ | definition | open | Wikipedia List of permutation topics#CGTY |
| Unproductive symbol | P7MJCZ5HF1 | unknown | open | Wikipedia Context-free grammar#P8J7 |
| Unprovable classical principles | 6SDZCWG2AQ | statement | open | Wikipedia Heyting arithmetic#B17H |
| unramified | QT4RMXDWFX | definition | open | Wikipedia Glossary of algebraic geometry#2HPV |
| unramified | Y3NF21QXBZ | definition | open | Wikipedia Glossary of commutative algebra#7PBP |
| Unramified case | X2XAQCAC5S | 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 2610.10583#M1DT |
| unramified morphism | N8RYPTETX6 | definition | open | Wikidata Q85812355, nLab unramified morphism, Wikipedia Unramified morphism |
| Unramified norm, trace, and conductor compatibility | BQ7HB5HJMV | 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 2610.10583#7F2E |
| unravelling the presentation | W3RRM5EM7F | 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 2609.32733#TQ4S |
| Unreasonable ineffectiveness of mathematics | FMRZBHE45D | definition | open | Wikipedia Unreasonable ineffectiveness of mathematics, Wikidata Q7897351 |
| Unregularized exact TD--PMD | 1293VW8W7T | 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 2609.39837#UTK5 |
| Unregularized value bound | GKABT4RC6B | 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 2610.04638#JTH5 |
| Unrestricted algorithm | PFCYF60Z9S | definition | open | Wikipedia Unrestricted algorithm, Wikidata Q30674308 |
| Unrestricted algorithm | QVFJWQJZCT | definition | open | Wikipedia List of algorithms#TC75, Wikipedia List of numerical analysis topics#306P |
| Unrestricted algorithm reduction of the activated BG-$a$ chain | 9MSX5SCPC1 | 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 2610.02355#00F8 |
| Unrestricted asymptotic comparison | K4EBSKS0GM | 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 2610.05442#3GYV |
| Unrestricted balanced Bellman inequality | QJ5BT2JVMA | 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 2609.24931#8VO9 |
| Unrestricted Bellman theorem implies balanced CK | JG8KKQHXAP | 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 2609.24931#HRLO |
| Unrestricted curvature-controlled contraction and deficit | 9WR4MPPB4Y | 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#Q3ZR |
| Unrestricted differential induction | 28XVC37ABN | 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 2609.24931#P887 |
| Unrestricted feasibility | FK8HHZ6XVC | 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 2609.24931#KDIT |
| Unrestricted grammar | 8Z3V1VDK22 | definition | open | Wikipedia Unrestricted grammar, Wikidata Q602934 |
| Unrestricted transform limits | HT5GR6HT2H | 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 2610.02531#T5XH |
| Unrooted binary tree | N8RCGHPPNG | definition | open | Wikipedia Unrooted binary tree, Wikidata Q7897401 |
| Unrooted tree | SAXSHK884S | unknown | open | Wikipedia Phylogenetic tree#BYA4 |
| Unruh effect | QZN0KQARB7 | definition | open | Wikipedia Unruh effect, Wikidata Q1568269 |
| Unruh radiation | P4GFZW6QNP | unknown | open | Wikipedia Unruh effect#GM7A |
| Unsatisfiable core | AFZY0VZA0W | definition | open | Wikipedia Unsatisfiable core, Wikidata Q7897421 |
| Unsatisfiable or redundant | 53S5WRE1YG | 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 2609.22407#38RC |
| Unscented Kalman filter | F5TRVGPGAR | unknown | open | Wikipedia Kalman filter#SFWS |
| Unscented optimal control | W6A28CMHYR | definition | open | Wikipedia Unscented optimal control, Wikidata Q96412768 |
| Unscented transform | AQZ77D9SNY | definition | open | Wikipedia Unscented transform, Wikidata Q7897426 |
| Unseen species problem | G2E04KBD11 | problem | open | Wikipedia List of statistics articles#DU1A |
| Unseen species problem | PZPE079AHK | problem | open | Wikipedia Unseen species problem, Wikidata Q56063388 |
| Unsigned and signed marked bounds | JXM3J8YZ25 | 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 2610.18884#CYDQ |
| Unsolvability of the Halting Problem | TG5SSXE341 | statement | open | open_logic content/turing-machines/undecidability/halting-problem.tex#thm:halting-problem |
| Unsolved problem | AJGSP7DJ5P | statement | open | Wikipedia Floor and ceiling functions#QO58 |
| Unsolved problems | 3AMKD2NZM5 | statement | open | Wikipedia Cosmic space#395G |
| Unsolved problems | 8EVC4T2NZ5 | statement | open | Wikipedia Hilbert's fourth problem#OYXZ |
| Unsolved problems | BARBZV6WD8 | statement | open | Wikipedia Gaussian integer#YHYK |
| Unsolved problems | C8ZPCAV4TS | statement | open | Wikipedia Millennium Prize Problems#HBYK |
| Unsolved problems | DTB52QVWSG | statement | open | Wikipedia Euler's totient function#G95F |
| Unsolved problems | FQY5KCDZV6 | statement | open | Wikipedia Euclid number#MJ8V |
| Unsolved problems | MDG71HE6J8 | statement | open | Wikipedia List of unsolved problems in mathematics#02VY |
| Unsolved problems | Q9Q3WJERJJ | statement | open | Wikipedia Chi-bounded#47OE |
| Unsolved problems | QBA6082MZD | statement | open | Wikipedia Diophantine approximation#3HI0 |
| Unsolved problems | QKQK9YRKFA | statement | open | Wikipedia Pcf theory#4LIF |
| Unsolved problems in statistics | QJ8JE0B8VC | topic | open | Wikipedia List of statistics articles#NCLM |
| Unsolved! | THZMTXQYEC | definition | open | Wikipedia Unsolved!, Wikidata Q124302083 |