| O'Brien–Fleming boundary | 5KPH1SM8QA | definition | open | Wikipedia List of statistics articles#A9AD |
| O'Brien–Fleming boundary | JNSKN2QVYC | definition | open | Wikipedia O'Brien–Fleming boundary, Wikidata Q136289101 |
| O'Nan group | V4NFNBFGRP | object | open | Wikidata Q3117692, MathWorld ONanGroup, Wikipedia O'Nan group |
| O'Nan group | Z40FH0EXHF | object | open | Wikipedia List of mathematical examples#CBUV |
| O'Nan moonshine | 56W9VZQF0T | unknown | open | Wikipedia O'Nan group#RIKW |
| O'Nan–Scott theorem | GPHNY572AB | statement | open | Wikipedia O'Nan–Scott theorem, Wikidata Q17099479 |
| O'Nan–Scott theorem | S07QQGYVDQ | statement | open | Wikipedia List of permutation topics#WLJ1 |
| O'Neil | 36QK2E5T9A | 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 2610.08074#4Y5K |
| O'Rourke--Touri 2016 | 7T0XMDHXJ0 | 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 2610.11047#M0SJ |
| O(1) | 45GESCGHJE | unknown | open | Wikipedia Big O notation#TBYO |
| O*-algebra | M48XE85JJ1 | definition | open | Wikipedia O*-algebra, Wikidata Q7071983 |
| O--Wu | RC8VB2AVTW | 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 2609.37208#A6JV |
| O--Wu, Lemma 3.1(c | KNYBC25SMP | 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 2609.37208#60LB |
| O--Wu, Remark 2.17 | 72HNRKSZX7 | 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 2609.37208#QYXG |
| O-BDRS as Overrelaxed Annealed Sinkhorn | CG58R4Q70V | 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 2609.33814#NRDG |
| O-Matrix | 5CDAYK5VJC | unknown | open | Wikipedia List of numerical-analysis software#QEKS |
| O-Matrix | 9G7FC3T03B | unknown | open | Wikipedia List of statistical software#4XUR |
| O-Matrix | CPR507NPHH | unknown | open | Wikipedia List of numerical-analysis software#NBWC |
| O-minimal | A2N5ZS4C0E | definition | open | Wikipedia List of unsolved problems in mathematics#7WAI |
| O-minimal theory | 5A14HBMWVW | definition | open | Wikipedia O-minimal theory, Wikidata Q7072039 |
| o-proposition | AFAE5262BB | definition | open | Wikipedia Glossary of logic#7Q6L |
| O. Hölder | Q3RGY1ZVXT | topic | open | Wikipedia List of group theory topics#2187 |
| O. I. Bogoyavlensky | 1V5FMY0VCG | unknown | open | Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#VQIG |
| O. Schreier | 63STXJJG9G | topic | open | Wikipedia List of group theory topics#A9JR |
| O/o | S5HKKDV4E7 | unknown | out_of_scope (a notation: the notation register holds it (corpus spec K10.4)) | Wikidata Q9941, ProofWiki Symbols:O |
| Oakley protocol | 825AQHQE3Q | definition | open | Wikipedia Oakley protocol, Wikidata Q7074169 |
| Oban number | YYW6A6BVS8 | object | open | Wikidata Q120336338, MathWorld ObanNumber, OEIS A008521 |
| Oban, New Zealand | 2GHS3JTQ28 | unknown | open | Wikipedia List of places with numeric names#AYBU |
| obelisk | Y472H58TPG | unknown | open | Wikidata Q170980, MathWorld Obelisk |
| Obelus | GFXCTS422D | definition | open | Wikipedia Obelus, Wikidata Q633466 |
| Oberliga West/West German Championship | WX64DYQ8EF | unknown | open | Wikipedia List of Borussia Dortmund records and statistics#XF4E |
| Oberwolfach Prize | NWBES8A9PG | unknown | open | Wikipedia Oberwolfach Research Institute for Mathematics#MD6V |
| Oberwolfach problem | 1X74QYYQXK | conjecture | open | Wikipedia Oberwolfach problem, Wikidata Q48999401 |
| Oberwolfach problem | H1DEHC68P4 | conjecture | open | Wikipedia List of unsolved problems in mathematics#NRBE |
| Oberwolfach Research Institute for Mathematics | E9Y9QA7PYV | definition | open | Wikipedia Oberwolfach Research Institute for Mathematics, Wikidata Q656142 |
| Obesity | 3JAMES4T7V | unknown | open | Wikipedia List of common misconceptions about science, technology, and mathematics#QIW4 |
| object | YTQXV7HAWS | definition | open | Wikipedia Glossary of category theory#SU1I |
| Object and Subject | 427QRHYWFR | unknown | open | Wikipedia Syntax#AUKJ |
| object language | 6V6WBDQV3Y | definition | open | Wikipedia Glossary of logic#J4FJ |
| object of a category | BP9B6HCXG4 | unknown | open | Wikidata Q10340026, MathWorld Object, nLab object |
| Object of the mind | 8R791JQVJY | definition | open | Wikipedia Object of the mind, Wikidata Q2611441 |
| Object oriented bounding box | AR63KFY5GC | unknown | open | Wikipedia Minimum bounding box#G5DF |
| object, classifier | GTES1VVC0G | concept | open | hott_book index/3.9/object-classifier |
| Object-centric | ZN4RR11Y0T | 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 2609.20478#5Q7J |
| Object-centric causal net | WHENH9WAQ7 | 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 2609.20478#BK4H |
| Object-centric Petri net | 1XZPZ7GYF9 | 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 2609.20478#Y4G0 |
| Object-centric process tree | RDVN4J12WZ | 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 2609.20478#NKMI |
| Object-orbit and isotropy structure of \(\Gamma_D\ | GXBAF2KRQM | 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 2609.25987#5D2R |
| Object-Oriented Turing | E2MFBM9FRE | unknown | open | Wikipedia List of things named after Alan Turing#KV25 |
| Objection | KCH6F3D5QN | definition | open | Wikipedia Objection (argument), Wikidata Q2090618 |
| Objection to the axiom of infinity | 1BCK3TQG6X | statement | open | Wikipedia Controversy over Cantor's theory#5B7H |
| Objections related to the law of the excluded middle and induction | R2Q40MS2N6 | statement | open | Wikipedia Brouwer–Hilbert controversy#OZ9G |
| Objective Bayesian probability | ZJW0EVJKEB | unknown | open | Wikipedia Bayesian probability#F6IY |
| objective idealism | 30690VR774 | unknown | open | Wikidata Q2011812, nLab objective idealism |
| Objective perturbation consistency | WZ456ZN5NN | 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 2610.11619#LYJR |
| Objective response rate | YKCW4GY7KS | unknown | open | Wikipedia Clinical endpoint#NJ6H |
| Objective stress rate | 1K1X1KZH7S | definition | open | Wikipedia Objective stress rate, Wikidata Q17105043 |
| Objective-gap and minimizer-retention certificate | 4XEEZDY27R | 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 2610.08821#UJFA |
| Objectivity illusion | VY7N3A9F4F | unknown | open | Wikipedia List of cognitive biases#P3TI |
| objectual quantifier | FW4ZK0A5HW | definition | open | Wikipedia Glossary of logic#UKDJ |
| Oblate sphere | ED8JKAGQ52 | unknown | open | Wikipedia Spheroid#LK7A |
| oblate spheroid | R0QWGBDJ28 | unknown | open | Wikidata Q3241540, MathWorld OblateSpheroid |
| oblate spheroidal coordinates | KRVKWC5G2M | definition | open | Wikidata Q11075615, MathWorld OblateSpheroidalCoordinates, Wikipedia Oblate spheroidal coordinates |
| Obligationes | YRQMV3Z97R | definition | open | Wikipedia Obligationes, Wikidata Q7782444 |
| Oblique asymptote | 6M7E4H78VY | unknown | open | Wikipedia Asymptote#SBP8 |
| Oblique lattice | 5D88AXT2M0 | definition | open | Wikipedia Oblique lattice, Wikidata Q114289253 |
| Oblique projection | NSPEB5FE0T | unknown | open | Wikipedia List of computer graphics and descriptive geometry topics#S5YA |
| Oblique pyramid | ZTYCDK14BN | unknown | open | Wikipedia Pyramid (geometry)#ZGGP |
| Oblique reflection | 5MJ4CCBYY4 | definition | open | Wikipedia Oblique reflection, Wikidata Q7075179 |
| Oblique shock | R5RKHAKSV2 | definition | open | Wikipedia Oblique shock, Wikidata Q7075180 |
| Oblivious HTTP | ND8T8DTM2M | definition | open | Wikipedia Oblivious HTTP, Wikidata Q132951464 |
| Oblivious pseudorandom function | JZ4839729V | definition | open | Wikipedia Oblivious pseudorandom function, Wikidata Q124485996 |
| Oblivious transfer | BQJB9C90KC | definition | open | Wikipedia Oblivious transfer, Wikidata Q2915383 |
| Observability | 5ERWPFHC56 | definition | open | Wikipedia Observability, Wikidata Q1369844 |
| Observability | FBNK4JJQJY | 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 2610.11968#EU5T |
| Observability | GG4X4MW291 | 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 2609.25431#A76Q |
| Observability | VN1M9HMBNW | definition | open | Wikipedia List of dualities#999R |
| Observability Gramian | KJWTBWJZF0 | definition | open | Wikipedia Observability Gramian, Wikidata Q7075420 |
| Observability up to a compact term | C9CFNE0C1H | 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 2610.11968#LYPL |
| Observable | N3FZSPB8ZF | definition | open | Wikipedia Observable, Wikidata Q845789 |
| Observable (quantum mechanics) | AX6070F384 | unknown | open | Wikipedia Observable#U337 |
| Observable chaos | JC73KRN43A | unknown | open | Wikipedia James A. Yorke#36D6 |
| Observable coverage test | H0Y77ZRYB7 | 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 2609.37380#JGTB |
| Observable distance | WCWX5J71QB | 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 2609.26262#QVPX |
| Observable lexical kernel | QY1DKVXW51 | 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 2609.20207#VG61 |
| Observable localization | V8TC70YZS3 | 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 2610.16248#611S |
| Observable Lyapunov exponent | QXR6K7S4PB | 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 2609.27484#JPO2 |
| Observable simultaneous chaining radius | V9YXZ1HEA1 | 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 2610.19207#M6Y7 |
| Observable subgroup | RF15RVM3PM | definition | open | Wikipedia Observable subgroup, Wikidata Q7075421 |
| Observable variable | SS8H6792FE | definition | open | Wikipedia List of statistics articles#T39G |
| Observable-kernel error propagation | 2B3YQEVSD6 | 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 2609.20207#VEPB |
| Observable-side converse | 74N9YKSSZZ | 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 2609.29348#FV3B |
| Observation during movement | S2JCY4GC9T | 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 2610.17677#PPD5 |
| Observation projection | MTHCM0015T | 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 2609.32078#JMQA |
| Observation-functional stopping and stopped PRP | 5X482A5ZR1 | 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 2609.28985#IO3V |
| Observational equivalence | HACVYFRXY9 | definition | open | Wikipedia Observational equivalence, Wikidata Q17121921 |
| Observational equivalence | P106WZPN66 | definition | open | Wikipedia List of statistics articles#FKUC |
| Observational error | DAW1Q6TSX4 | definition | open | Wikipedia Observational error, Wikidata Q196372 |
| Observational error | MFYENMEJFJ | definition | open | Wikipedia List of statistics articles#HUGO, Wikipedia List of probability topics#HAWP |
| Observational interpretation fallacy | 5BAS0FJBHW | unknown | open | Wikipedia List of fallacies#S5P1 |