| One-way analysis of variance | Q4KH6H7P1J | definition | open | Wikipedia One-way analysis of variance, Wikidata Q7092351 |
| One-way analysis of variance | T1MVPGBE13 | definition | open | Wikipedia List of statistics articles#KTW7 |
| One-way compression function | AM3MKS4BVM | definition | open | Wikipedia List of algebraic coding theory topics#0EHX |
| One-way compression function | VMV3K2MX36 | definition | open | Wikipedia One-way compression function, Wikidata Q3075219 |
| One-way function | 8VZT3J8Q5K | conjecture | open | Wikipedia List of computability and complexity topics#AS3M |
| one-way function | QVJNRHPVFM | conjecture | open | Wikidata Q720931, MathWorld One-WayFunction, Wikipedia One-way function |
| One-way function | Y278MA5B03 | conjecture | open | Wikipedia List of unsolved problems in computer science#WFV2 |
| One-way functions against circuits | FPZHY0E7C4 | 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 2610.14615#XNPC |
| One-way wave equation | 23724Z4E28 | definition | open | Wikipedia One-way wave equation, Wikidata Q97359230 |
| One-window continuation | 1HH1HN615T | 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 2610.02721#7MRW |
| One-window globalization | GRS3CT8PGR | 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 2610.02721#6I93 |
| Oneoneone | CJCEXYWJK5 | unknown | open | Wikipedia Exclamation mark#UPYH |
| Ones' complement | R8T1P35FQS | definition | open | Wikipedia Ones' complement, Wikidata Q1361630 |
| Onicescu, Octav | EW3S63DEYN | unknown | open | Wikipedia List of statisticians#2H6E |
| Onion Transport Lemma | P8EGZXA922 | 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 2610.20391#VIEI |
| Online algorithm | 53HN5AGEZS | unknown | open | Wikipedia List of algorithm general topics#3CFG |
| Online analytical processing | 2ES3N0SSHY | definition | open | Wikipedia Online analytical processing, Wikidata Q642514 |
| Online bipartite matching | S820P2749E | unknown | open | Wikipedia Matching (graph theory)#9CRK |
| Online calculator | 2GNQBFX0WH | unknown | open | Wikipedia Software calculator#N14O |
| Online clinical trials | TTCR79WT4F | unknown | open | Wikipedia Clinical trial#ALZA |
| Online fair division | KZPDJQZDMF | definition | open | Wikipedia Online fair division, Wikidata Q106350161 |
| Online inference | H4GXGS6VFW | 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 2610.12873#X0I2 |
| Online matrix-vector multiplication problem | Q4B6EQTZG9 | conjecture | open | Wikipedia Online matrix-vector multiplication problem, Wikidata Q125924475 |
| Online NMF | M4188XVMTW | definition | open | Wikipedia List of statistics articles#30Z9 |
| Online overidentification test | VE0JBA5JRW | 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 2610.12873#4J36 |
| Online preservation | WDY59BMSNE | 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 2610.04027#UT4N |
| Online reduction | RJSA39W5BX | 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 2609.20687#NHQB |
| Online regret | N82EDXXVYH | 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 2609.33291#1QLZ |
| only 10% of their brains | 7PFX6NVWGC | unknown | open | Wikipedia List of common misconceptions about science, technology, and mathematics#VA8Y |
| Only arcs | HZH7MQJ8CF | 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 2610.02219#FH5J |
| Only the knots move | XK0K1RVB9H | 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 2609.21271#PTGI |
| Only the side of one half matters | GKJ6E875BM | 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 2610.21363#5WOZ |
| Only three patterns are possible | 6SXNRW4JBE | 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 2609.23781#I1ES |
| Onno J. Boxma | 52E8NA7P4F | topic | open | Wikipedia List of people by Erdős number#BGQD |
| Onno J. Boxma | J2TNGAYDA6 | topic | open | Wikipedia Onno J. Boxma, Wikidata Q7094399 |
| Ono's inequality | 2Z0CJR3HHT | statement | open | Wikipedia List of inequalities#74H5 |
| Ono's inequality | S59B47HH8R | statement | open | Wikidata Q1054182, MathWorld OnoInequality, Wikipedia Ono's inequality |
| Onofrio Puglisi | 8PA0M4B1HZ | topic | open | Wikipedia Onofrio Puglisi, Wikidata Q21208961 |
| Onofrio Puglisi | WHC93Y9C3D | topic | open | Wikipedia List of Italian mathematicians#4HDQ |
| Onorato Candiota | 3TA0VWY8P7 | topic | open | Wikipedia Onorato Candiota, Wikidata Q58011267 |
| Onorato Nicoletti | 9YPGR6TBYZ | topic | open | Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#YOXC |
| Onorato Nicoletti | T9MPX0FVAV | topic | open | Wikipedia Onorato Nicoletti, Wikidata Q16658078 |
| Onsager | 8YXVEB7BYZ | 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 2610.20910#V1PN |
| Onsager reciprocal relations | HDTTV11W35 | definition | open | Wikipedia Onsager reciprocal relations, Wikidata Q901483 |
| Onsager shift | 8EQQ8QYYPD | 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 2610.06490#LU99 |
| Onsager's formula for spontaneous magnetization | W22WB0S8JF | statement | open | Wikipedia Ising model#3QPA |
| Onsager–Machlup function | AP65RGA1N4 | definition | open | Wikipedia List of stochastic processes topics#ICE2 |
| Onsager–Machlup function | K0B76TGKHZ | definition | open | Wikipedia Onsager–Machlup function, Wikidata Q17104894 |
| onset and the gap, $\theta = 0$ | WDDXH0K1GQ | 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 2610.00902#CZ62 |
| Onslow, William | 3XMHHMXG9F | unknown | open | Wikipedia List of statisticians#348D |
| ontic vagueness | 4QY93C0X7Y | definition | open | Wikipedia Glossary of logic#M42C |
| onto | 3YERT7V4BV | concept | open | levin_dmoi index/1.4.2/onto |
| onto | 9ZKBWHRWXB | concept | open | active_calculus index/2.6.2/onto |
| onto | A5PDWV85AG | definition | open | Wikipedia Glossary of mathematical jargon#G90T |
| onto | EN019R4F7Z | definition | open | Wikipedia Glossary of logic#YOY9 |
| Ontological commitment | P18F44XEGX | definition | open | Wikipedia Ontological commitment, Wikidata Q7095045 |
| Ontological maximalism | D429XVWT60 | definition | open | Wikipedia Ontological maximalism, Wikidata Q2611745 |
| Ontological pluralism | 3RMA1XGEQJ | unknown | open | Wikipedia Philosophical pluralism#THXE |
| ontology | SBBXWADC22 | unknown | open | Wikidata Q44325, nLab ontology |
| Ooguri–Vafa metric | K9BQ86FPNE | definition | open | Wikipedia Ooguri–Vafa metric, Wikidata Q133784520 |
| Oort constants | 53M8BTSM9S | definition | open | Wikipedia Oort constants, Wikidata Q1775715 |
| op-fibration | VKNQERZ2X4 | definition | open | Wikipedia Glossary of category theory#BV1S |
| Opacity | 59S8TJK4AC | definition | open | Wikipedia Opacity, Wikidata Q691914 |
| Opaque context | 543FSCFP9R | definition | open | Wikipedia Opaque context, Wikidata Q1665723 |
| Opaque forest problem | Z416SEMM3H | definition | open | Wikipedia List of unsolved problems in mathematics#7LYU |
| Opaque set | H6B2RC01Z2 | definition | open | Wikipedia Opaque set, Wikidata Q16867981 |
| open | 4T88GW8RBB | definition | open | Wikipedia Glossary of graph theory#JRSE |
| open | 6K838TH15P | definition | open | Wikipedia Glossary of algebraic geometry#OGHJ |
| open | FBDVPAM3SC | definition | open | Wikipedia Glossary of real and complex analysis#XDZO |
| open | TA3K4EDQX6 | definition | open | Wikipedia Glossary of functional analysis#EZUA |
| Open and closed maps | JXWMP3HKPY | definition | open | Wikipedia Open and closed maps, Wikidata Q2632649 |
| open ball | 1ZCV4KF5WN | unknown | node (a node has the same name as the row) | Wikidata Q2921739, MathWorld OpenBall |
| Open ball | HY650YR54J | definition | open | Wikipedia List of general topology topics#NNE3 |
| Open ball | ZM99D9V1DX | definition | open | Wikipedia Glossary of general topology#YVFL |
| Open book decomposition | NYMCZ72EXF | definition | open | Wikipedia Open book decomposition, Wikidata Q3527238 |
| Open castles | Z4S51CA2MR | 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#YX9S |
| Open coloring axiom | RQ3EGXCJD2 | statement | open | Wikipedia List of unsolved problems in mathematics#PKGZ |
| Open coloring axiom | WS5FS9KM7G | statement | open | Wikipedia List of statements independent of ZFC#QN3D |
| Open coloring axiom | Y1GX4YDDKG | statement | open | Wikipedia Open coloring axiom, Wikidata Q17332474 |
| Open condition | 1XWRJVKF2P | 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 2609.28024#FY1R |
| Open condition | 87K4YYFNRZ | definition | open | Wikipedia Glossary of general topology#K6QH |
| open cover | 1906G9J52Q | definition | node (a node has the same name as the row) | Wikidata Q41509136, MathWorld OpenCover, nLab open cover, ProofWiki Definition:Open_Cover |
| Open cover | 323QXV6F34 | definition | open | Wikipedia List of general topology topics#AT6A |
| Open cover | HDREFREA69 | definition | open | Wikipedia Glossary of general topology#SV0I |
| Open cover homology theorem | P2YN051E0A | statement | open | napkin tex/homology/long-exact.tex#thm:open_cover_homology |
| open cylinder | 3P4Y3VHK6V | definition | open | Wikipedia Cylinder#AWMZ |
| open formula | FEMAATDWY0 | definition | open | Wikipedia Glossary of logic#5NI5 |
| open formula | ZXW9JN7GH7 | statement | open | Wikidata Q830486, MathWorld OpenSententialFormula, Wikipedia Open formula |
| Open formulas | QP6DRCJ7DZ | statement | open | Wikipedia Independence-friendly logic#QQN7 |
| Open function | NSD3VW71B7 | definition | open | Wikipedia Glossary of general topology#1DRU |
| Open function | SGA72QAMZ0 | definition | open | Wikipedia List of types of functions#EH1Q |
| Open Graph Theorem | 2ZKK27Y099 | statement | open | Wikipedia Hemicontinuity#55I5 |
| Open graph theorem | H27QT5BHA1 | statement | open | Wikipedia Hemicontinuity#23V7 |
| Open hashing | X6C5D7XCPD | unknown | open | Wikipedia Hash table#281A |
| open interval | 5GNYRT1VXT | definition | open | Wikidata Q16690243, EoM Interval,_open, MathWorld OpenInterval, ProofWiki Definition:Interval/Ordered_Set/Open |
| open interval | QBR8HWDD8Q | definition | open | Wikipedia Glossary of mathematical symbols#WSXQ |
| Open knot theory | 7YAR6F7PWG | definition | open | Wikipedia Open knot theory, Wikidata Q136446233 |
| Open Logic Project | T9YZ9MVE1S | unknown | open | Wikidata Q99732303, nLab Open Logic Project |
| open manifold | 9WTTGW6PPQ | concept | open | Wikidata Q56298741, MathWorld OpenManifold |
| open map | HF25B4ZJMH | unknown | open | Wikidata Q56653513, MathWorld OpenMap, nLab open map |