| Isaac Barrow | MEBMFJHYN3 | topic | open | Wikipedia Isaac Barrow, Wikidata Q207718 |
| Isaac ben Moses Eli | BBNMS7CZ9X | topic | open | Wikipedia List of Jewish mathematicians#RI14 |
| Isaac ben Moses Eli | DNKWNK2CE4 | topic | open | Wikipedia Isaac ben Moses Eli, Wikidata Q55643101 |
| Isaac Boleslavsky | BB0W67K0DF | unknown | open | Wikipedia List of Ukrainian Jews#UBHJ |
| Isaac Chuang | 91W1BSY6E5 | unknown | open | Wikipedia List of people by Erdős number#OKOE |
| Isaac Hourwich | GGVD700R5V | unknown | open | Wikipedia List of Jewish mathematicians#HMG1 |
| Isaac ibn al-Ahdab | BT7G02ZA8Q | topic | open | Wikipedia List of Jewish mathematicians#AM4J |
| Isaac ibn al-Ahdab | JM3WKZS8G3 | topic | open | Wikipedia Isaac ibn al-Ahdab, Wikidata Q25492636 |
| Isaac Israeli | 7K0EGPEYRF | unknown | open | Wikipedia List of Jewish mathematicians#LUAE |
| Isaac Jacob Schoenberg | R3ZMG7JFC5 | topic | open | Wikipedia List of people by Erdős number#U749 |
| Isaac Jacob Schoenberg | SZJH8CBWH7 | topic | out_of_scope (a person, not an item of mathematics) | Wikidata Q537974, ProofWiki Mathematician:Isaac_Jacob_Schoenberg, Wikipedia Isaac Jacob Schoenberg |
| Isaac Milner | EY1A82G52Y | topic | open | Wikipedia Isaac Milner, Wikidata Q931384 |
| Isaac Namioka | 6KQK3BAS6N | unknown | open | Wikipedia List of people by Erdős number#93UY |
| Isaac Newton | 4XS1AMFNN1 | topic | open | Wikipedia List of publications in mathematics#RMCB |
| Isaac Newton | HEGRCWZ94J | topic | open | Wikipedia List of calculus topics#MXIL |
| Isaac Newton | M3GTB6XC4E | topic | open | Wikipedia List of geometers#M74B |
| Isaac Newton | RB0BSD92NT | topic | out_of_scope (a person, not an item of mathematics) | Wikidata Q935, nLab Isaac Newton, ProofWiki Mathematician:Isaac_Newton, Wikipedia Isaac Newton |
| Isaac Newton | TD64GV6VH8 | topic | open | Wikipedia List of publications in mathematics#M055 |
| Isaac Newton Institute | FM7PV1FM2W | definition | open | Wikipedia Isaac Newton Institute, Wikidata Q126075 |
| Isaac Newton's apple tree | MYM06KTSQM | unknown | open | Wikipedia Isaac Newton#T3WS |
| Isaac of Stella | F414WQ0T38 | topic | open | Wikipedia Isaac of Stella, Wikidata Q1673525 |
| Isaac Samuel Reggio | RKEK7T1KZH | unknown | open | Wikipedia List of Jewish mathematicians#B9XF |
| Isaac Schoenberg | KRQS0W76RR | topic | open | Wikipedia List of Jewish mathematicians#BGOS |
| Isaac Stern | CMPRCK5486 | unknown | open | Wikipedia List of Ukrainian Jews#3EG2 |
| Isaac Watts | YRGF82S5SY | topic | open | Wikipedia List of logicians#R2XH |
| Isaac Watts | ZSS5CDNN9S | topic | open | Wikipedia Isaac Watts, Wikidata Q537034 |
| Isaak Bacharach | S6W0XS5BAH | topic | open | Wikipedia Isaak Bacharach, Wikidata Q6077484 |
| Isaak Bacharach | VEV579DFZ0 | topic | open | Wikipedia List of German mathematicians#SEC6 |
| Isaak Bacharach | ZYA9F2H3KS | topic | open | Wikipedia List of Jewish mathematicians#SEI2 |
| Isaak Dunayevsky | D3960TJQWW | unknown | open | Wikipedia List of Ukrainian Jews#O8Z6 |
| Isaak Markovich Khalatnikov | DGR9YGN5Y2 | unknown | open | Wikipedia List of contributors to general relativity#DYEG |
| Isaak Markovich Khalatnikov | N2GARYT59D | unknown | open | Wikipedia List of Ukrainian Jews#T86K |
| Isaak Moiseevich Milin | T38J7CB2P7 | topic | open | Wikipedia Isaak Moiseevich Milin, Wikidata Q19360105 |
| Isaak Pomeranchuk | 2TYS7KJRCP | unknown | open | Wikipedia List of Ukrainian Jews#EMME |
| Isaak Yaglom | 5T9XHSW7WR | topic | out_of_scope (a person, not an item of mathematics) | Wikidata Q1565305, ProofWiki Mathematician:Isaak_Moiseyevich_Yaglom, Wikipedia Isaak Yaglom |
| Isaak Yaglom | 7GJ62A0SAW | topic | open | Wikipedia List of Jewish mathematicians#YJMA |
| Isaak Yaglom | TNW2CYKJ60 | topic | open | Wikipedia List of geometers#5QAF |
| Isabel Dotti | FMXT06DMTG | topic | open | Wikipedia Isabel Dotti, Wikidata Q102124225 |
| Isabel Fernández | 9B9MV3DATA | topic | open | Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#8FNO |
| Isabel Fernández | JSMFJ6QX59 | topic | open | Wikipedia Isabel Fernández (mathematician), Wikidata Q59617961 |
| Isabel Hubard Escalera | 7WR8H9J8SH | topic | open | Wikipedia Isabel Hubard Escalera, Wikidata Q20995118 |
| Isabel Maddison | M6FP8WPTVK | topic | open | Wikipedia Isabel Maddison, Wikidata Q4678279 |
| Isabella Bashmakova | HZQS4D5RX4 | topic | open | Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#FB1O |
| Isabella Bashmakova | JBMDZ2MRDY | topic | open | Wikipedia Isabella Bashmakova, Wikidata Q1673591 |
| Isabella Novik | R4K1Y215QE | topic | open | Wikipedia List of people by Erdős number#ZZYL, Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#NDR0 |
| Isabella Novik | V5ZYKG12XH | topic | open | Wikipedia Isabella Novik, Wikidata Q27773785 |
| Isabelle | 77DRVPQ8R4 | definition | open | Wikidata Q460340, nLab Isabelle, Wikipedia Isabelle (proof assistant) |
| Isabelle Chalendar | ZYYV145ERW | topic | open | Wikipedia Isabelle Chalendar, Wikidata Q102311532 |
| Isabelle Gallagher | 2KZS8DDJQS | topic | open | Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#1A84 |
| Isabelle Gallagher | W7XFA6TQEM | topic | open | Wikipedia Isabelle Gallagher, Wikidata Q6470312 |
| Isabelle theorem prover | V8CH2Y3WKD | definition | open | Wikipedia List of mathematical logic topics#L00L |
| Isador Lubin | CE0598GV7H | topic | open | Wikipedia List of fellows of the American Statistical Association#QUQV |
| Isador Lubin | MCWM3SGF0F | topic | open | Wikipedia Isador Lubin, Wikidata Q16008410 |
| Isador M. Sheffer | KPS2H2QAK9 | topic | open | Wikipedia Isador M. Sheffer, Wikidata Q6078352 |
| Isadore Manuel Singer | N4Z0058NVH | topic | open | Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#RYO7 |
| Isadore Singer | MNEVFBK4DX | topic | out_of_scope (a person, not an item of mathematics) | Wikidata Q353407, nLab Isadore Singer, Wikipedia Isadore Singer |
| Isadore Singer | RF09NCH6T2 | topic | open | Wikipedia List of people by Erdős number#9MTX |
| Isadore Singer | VAX40KV5GG | topic | open | Wikipedia List of Jewish mathematicians#ZFPP |
| Isagoge | 9VVGE39RY6 | unknown | open | Wikipedia List of works by Averroes#49Q3 |
| Isaiah Kantor | ZGPJ0R2A60 | topic | out_of_scope (a person, not an item of mathematics) | Wikidata Q6078534, nLab Isaiah Kantor, Wikipedia Isaiah Kantor |
| Isallobar | HW8SA72AEK | unknown | open | Wikipedia Contour line#Y9TK |
| IsaPlanner | NGH3KKQENX | definition | open | Wikipedia IsaPlanner, Wikidata Q6075663 |
| Isbell | 2EGVF0DQD9 | definition | open | Wikipedia Glossary of category theory#VACM |
| Isbell duality | MVEPEHAQ58 | definition | open | Wikipedia Isbell duality, Wikidata Q16978887 |
| Isbell duality | MVJFX6J6FY | definition | open | Wikipedia List of dualities#0XFG |
| Isbell's zigzag theorem | RRE902Q3C6 | statement | open | Wikipedia Isbell's zigzag theorem, Wikidata Q123171251 |
| Isbell's zigzag theorem | V0PSTR15DN | statement | open | Wikipedia Isbell's zigzag theorem#NBU8 |
| ISBN | 4FMHQRHCYW | unknown | open | Wikipedia List of algebraic coding theory topics#W2AI |
| Isentropic flow | CPPN1DZECW | unknown | open | Wikipedia Isentropic process#AN01 |
| Isentropic process | 9NHVXVWXHC | definition | open | Wikipedia Isentropic process, Wikidata Q907271 |
| Isfahani Abol-fath | MZCSJ58FJS | unknown | open | Wikipedia List of Iranian mathematicians#MADJ |
| Ishak Efendi | E97VTCVQTE | unknown | open | Wikipedia List of Jewish mathematicians#MW2L |
| Isham, Valerie | 5ANEWA6JP5 | unknown | open | Wikipedia List of statisticians#TJ2M |
| Ishango bone | N6BJ7JZ6G1 | definition | open | Wikidata Q1077717, MathWorld IshangoBone, Wikipedia Ishango bone |
| Ishii--Nimura | R5WBB6GPAZ | 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 2610.16962#ATJL |
| Ishikawa diagram | 4CWRFQWM1Q | unknown | open | Wikipedia List of graphical methods#8W1A |
| Ishikawa, Kaoru | 26S4K0S6AB | topic | open | Wikipedia List of statisticians#N7L1 |
| Ishimori equation | EC0HXDE5V7 | definition | open | Wikipedia Ishimori equation, Wikidata Q17098402 |
| Ishimori equation | P5KQDGRNRF | definition | open | Wikipedia List of named differential equations#IBXE |
| Ishioka--Kunugi | 61WF1CB4H0 | 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 2609.25967#LW9P |
| Isidor Natanson | JESB2JBJKA | topic | open | Wikipedia Isidor Natanson, Wikidata Q4314155 |
| Isidor Natanson | VZQPZ4VRFN | topic | open | Wikipedia List of Jewish mathematicians#XSBC |
| Isidore Isaac Hirschman Jr. | NDKQJB2TYZ | topic | open | Wikipedia Isidore Isaac Hirschman Jr., Wikidata Q6080929 |
| Isidore of Miletus | 33NZT36GQA | unknown | out_of_scope (a person, not an item of mathematics) | Wikidata Q310028, ProofWiki Mathematician:Isidorus_of_Miletus |
| Isidore of Miletus | WCF23X6A9G | unknown | open | Wikipedia List of Greek mathematicians#EG6K |
| Ising critical exponents | SZ8HBPMKQP | unknown | open | Wikipedia Universality class#GU06 |
| Ising machine | HK7R8W4KA9 | definition | open | Wikipedia Ising machine |
| Ising model | 2GRNBCWPP8 | definition | open | Wikidata Q1076349, EoM Ising_model, MathWorld IsingModel, nLab Ising model, Wikipedia Ising model |
| Ising pair ratio | G132WGP4V5 | 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 2609.22301#6OTV |
| Iskander Taimanov | HRCFR19Y7E | topic | open | Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#NQ63 |
| Iskander Taimanov | NCZFM5DAK2 | topic | open | Wikipedia Iskander Taimanov, Wikidata Q4449881 |
| Islam and religious pluralism | DAZMAX6JV3 | unknown | open | Wikipedia Religious pluralism#2X54 |
| Islamic calendar | NR8XFWBRZ9 | definition | open | Wikidata Q28892, ProofWiki Definition:Calendar/Muslim |
| Islamic law and theology | B5SDBC4NTH | statement | open | Wikipedia Logic in Islamic philosophy#D0L6 |
| Islamic mathematics | KRYX1F9QRW | definition | open | Wikipedia List of mathematics history topics#VMQW |
| Island Davaar | 5WJTMP0NQR | unknown | open | Wikipedia List of places with numeric names#SO1Y |
| Island of California | W6NTGHWP1S | unknown | open | Wikipedia List of superseded scientific theories#MKTP |
| island of knights and knaves | GW406TE0GR | definition | open | Wikipedia Glossary of logic#VB7T |
| Ismail--Obermaier 2011 | KX10GXA7F3 | 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 2306.16411#OB05 |
| Ismar Volić | 6CGVJR3RFK | topic | open | Wikipedia Ismar Volić, Wikidata Q98556539 |