Daftar tetapan matematis
1950–1999

| Nama | Simbol | Ekspansi desimal | Rumus | Tahun | Himpunan |
| --- | --- | --- | --- | --- | --- |
| Tetapan Van der Pauw |  {\alpha } | 4.53236 01418 27193 80962 |  {\frac {\pi }{\ln(2)}}={\frac {\sum \limits _{n=0}^{\infty }{\frac {4(-1)^{n}}{2n+1}}}{\sum \limits _{n=1}^{\infty }{\frac {(-1)^{n+1}}{n}}}}={\frac {{\frac {4}{1}}-{\frac {4}{3}}+{\frac {4}{5}}-{\frac {4}{7}}+{\frac {4}{9}}-\cdots }{{\frac {1}{1}}-{\frac {1}{2}}+{\frac {1}{3}}-{\frac {1}{4}}+{\frac {1}{5}}-\cdots }} | Sebelum tahun 1958 |  |
| Sudut ajaib  |  {\theta _{m}} | 0.95531 66181 245092 78163 |  \arctan \left({\sqrt {2}}\right)=\arccos \left({\sqrt {\tfrac {1}{3}}}\right)\approx \textstyle {54.7356}^{\circ } | Sebelum tahun 1959 |  \mathbb {T}  |
| Tetapan Lochs  |  {{\text{£}}_{\text{Lo}}} | 0.97027 01143 92033 92574  |  {\frac {6\ln 2\ln 10}{\pi ^{2}}} | 1964 |  |
| Tetapan es persegi Lieb  |  {W}_{2D} | 1.53960 07178 39002 03869  |  \lim _{n\to \infty }(f(n))^{n^{-2}}=\left({\frac {4}{3}}\right)^{\frac {3}{2}}={\frac {8}{3{\sqrt {3}}}} | 1967 |  \mathbb {A}  |
| Tetapan Niven  |  {C} | 1.70521 11401 05367 76428  |  1+\sum _{n=2}^{\infty }\left(1-{\frac {1}{\zeta (n)}}\right) | 1969 |  |
| Tetapan Baker  |  \beta _{3} | 0.83564 88482 64721 05333 |  \int _{0}^{1}{\frac {\mathrm {d} t}{1+t^{3}}}=\sum _{n=0}^{\infty }{\frac {(-1)^{n}}{3n+1}}={\frac {1}{3}}\left(\ln 2+{\frac {\pi }{\sqrt {3}}}\right) | Sebelum tahun 1969 |  |
| Tetapan Porter |  {C} | 1.46707 80794 33975 47289  |  {\frac {6\ln 2}{\pi ^{2}}}\left(3\ln 2+4\,\gamma -{\frac {24}{\pi ^{2}}}\,\zeta '(2)-2\right)-{\frac {1}{2}} dimana  \scriptstyle \gamma  adalah tetapan Euler–Mascheroni dengan nilai 0.5772156649... dan  \scriptstyle \zeta '(2) adalah turunan dari  \scriptstyle \zeta (2) dengan nilai –0.9375482543... | 1974 |  |
| Tetapan Feigenbaum (δ)  |  {\delta } | 4.66920 16091 02990 67185  |  \lim _{n\to \infty }{\frac {x_{n+1}-x_{n}}{x_{n+2}-x_{n+1}}},\quad x\in (3.8284;\,3.8495) dimana  \scriptstyle x_{n+1}=\,ax_{n}(1-x_{n})\quad {\text{atau}}\quad x_{n+1}=\,a\sin(x_{n}). | 1975 |  |
| Tetapan Chaitin  |  \Omega  | Secara umum mereka merupakan bilangan yang tak dapat dihitung. Tapi salah satu bilangannya 0.00787 49969 97812 3844  |  \sum _{p\in P}2^{-|p|}  p adalah program terhenti;   \left|p\right| adalah ukuran dalam bit program  Size in bits of program  p; dan   P adalah ranah semua program yang berhenti. Lihat pula: Masalah penghentian | 1975 |  \mathbb {T}  |
| Tetapan Fransén–Robinson  |  {F} | 2.80777 02420 28519 36522  |  \int _{0}^{\infty }{\frac {1}{\Gamma (x)}}\,\mathrm {d} x=e+\int _{0}^{\infty }{\frac {e^{-x}}{\pi ^{2}+\ln ^{2}x}}\,\mathrm {d} x | 1978 |  |
| Tetapan Robbins  |  \Delta (3) | 0.66170 71822 67176 23515  |  {\frac {4\!+\!17{\sqrt {2}}\!-6{\sqrt {3}}\!-7\pi }{105}}\!+\!{\frac {\ln(1\!+\!{\sqrt {2}})}{5}}\!+\!{\frac {2\ln(2\!+\!{\sqrt {3}})}{5}} | 1978 |  |
| Tetapan Feigenbaum (α)  |  \alpha  | 2.50290 78750 95892 82228  |  \lim _{n\to \infty }{\frac {d_{n}}{d_{n+1}}} | 1979 |  \mathbb {T} ? |
| Dimensi fraktal dari himpunan Cantor  |  d_{f}(k) | 0.63092 97535 71457 43709  |  \lim _{\varepsilon \to 0}{\frac {\log N(\varepsilon )}{\log \left({\frac {1}{\varepsilon }}\right)}}={\frac {\log 2}{\log 3}} | Sebelum tahun 1979 |  \mathbb {T}  |
| Tetapan perangkai  |  {\mu } | 1.84775 90650 22573 51225  |  {\sqrt {2+{\sqrt {2}}}}\;=\lim _{n\rightarrow \infty }c_{n}^{1/n} sebagai sebuah akar dari polinomial  x^{4}-4x^{2}+2=0. | 1982 |  \mathbb {A}  |
| Tetapan konjektur Lehmer  |  {\sigma _{_{10}}} | 1.17628 08182 59917 50654  |  x^{10}+x^{9}-x^{7}-x^{6}-x^{5}-x^{4}-x^{3}+x+1 | 1983? |  \mathbb {A}  |
| Tetapan Chebyshev  ·  |  \lambda _{\text{Ch}} | 0.59017 02995 08048 11302  |  {\frac {\Gamma \left({\frac {1}{4}}\right)^{2}}{4\pi ^{\frac {3}{2}}}}={\frac {4\left({\frac {1}{4}}!\right)^{2}}{\pi ^{\frac {3}{2}}}} | Sebelum tahun 1987 |  |
| Tetapan Conway  |  {\lambda } | 1.30357 72690 34296 39125  |  {\begin{smallmatrix}x^{71}\quad \ -x^{69}-2x^{68}-x^{67}+2x^{66}+2x^{65}+x^{64}-x^{63}-x^{62}-x^{61}-x^{60}\\-x^{59}+2x^{58}+5x^{57}+3x^{56}-2x^{55}-10x^{54}-3x^{53}-2x^{52}+6x^{51}+6x^{50}\\+x^{49}+9x^{48}-3x^{47}-7x^{46}-8x^{45}-8x^{44}+10x^{43}+6x^{42}+8x^{41}-5x^{40}\\-12x^{39}+7x^{38}-7x^{37}+7x^{36}+x^{35}-3x^{34}+10x^{33}+x^{32}-6x^{31}-2x^{30}\\-10x^{29}-3x^{28}+2x^{27}+9x^{26}-3x^{25}+14x^{24}-8x^{23}\quad \ -7x^{21}+9x^{20}\\+3x^{19}\!-4x^{18}\!-10x^{17}\!-7x^{16}\!+12x^{15}\!+7x^{14}\!+2x^{13}\!-12x^{12}\!-4x^{11}\!-2x^{10}\\+5x^{9}+x^{7}\quad \ -7x^{6}+7x^{5}-4x^{4}+12x^{3}-6x^{2}+3x-6\ =\ 0\quad \quad \quad \end{smallmatrix}} | 1987 |  \mathbb {A}  |
| Tetapan Prévost, tetapan Fibonacci timbal-balik  |  \Psi  | 3.35988 56662 43177 55317  |  \sum _{n=1}^{\infty }{\frac {1}{F_{n}}}={\frac {1}{1}}+{\frac {1}{1}}+{\frac {1}{2}}+{\frac {1}{3}}+{\frac {1}{5}}+{\frac {1}{8}}+{\frac {1}{13}}+\cdots  dimana  F_{n} adalah deret Fibonacci. | Sebelum tahun 1988 |  \mathbb {R} \setminus \mathbb {Q}  |
| Tetapan Brun 2 = Σ balikan bilangan prima kembar  |  {B}_{\,2} | 1.90216 05831 04  |  {\underset {p,\,p+2:{\text{ prima}}}{\sum \left({\frac {1}{p}}+{\frac {1}{p+2}}\right)}}=\left({\frac {1}{3}}\!+\!{\frac {1}{5}}\right)+\left({\frac {1}{5}}\!+\!{\frac {1}{7}}\right)+\left({\frac {1}{11}}\!+\!{\frac {1}{13}}\right)+\cdots  | 1989 |  |
| Tetapan Hafner–Sarnak–McCurley (1)  |  {\sigma } | 0.35323 63718 54995 98454  |  \prod _{k=1}^{\infty }\left\{1-[1-\prod _{j=1}^{n}{\underset {p_{k}:{\text{ prima}}}{(1-p_{k}^{-j})]^{2}}}\right\} | 1993 |  |
| Dimensi fraktal dari pengepakan Apollo mengenai lingkaran   |   \varepsilon  | 1.30568 6729 oleh Thomas & Dhar 1.30568 8 oleh McMullen  |  | 1994  1998 |  |
| Tetapan Backhouse  |  {B} | 1.45607 49485 82689 67139  |  \lim _{k\to \infty }\left|{\frac {q_{k+1}}{q_{k}}}\right\vert dimana  Q(x)={\frac {1}{P(x)}}=\!\sum _{k=1}^{\infty }q_{k}x^{k} dan  P(x)=\sum _{k=1}^{\infty }{\underset {p_{k}{\text{ prima}}}{p_{k}x^{k}}}=1+2x+3x^{2}+5x^{3}+\cdots  | 1995 |  |
| Tetapan Viswanath  |  {C}_{\text{Vi}} | 1.13198 82487 943  |  \lim _{n\to \infty }|a_{n}|^{\frac {1}{n}}dimana  a_{n} adalah barisan Fibonacci | 1997 |  \mathbb {T} ? |
| Tetapan waktu  |  {\tau } | 0.63212 05588 28557 67840  |  {\begin{aligned}\lim _{n\to \infty }1-{\frac {!n}{n!}}&=\lim _{n\to \infty }P(n)\\&=\int _{0}^{1}e^{-x}dx\\&=1{-}{\frac {1}{e}}\\&=\sum \limits _{n=1}^{\infty }{\frac {(-1)^{n+1}}{n!}}={\frac {1}{1!}}{-}{\frac {1}{2!}}{+}{\frac {1}{3!}}{-}{\frac {1}{4!}}{+}{\frac {1}{5!}}{-}{\frac {1}{6!}}{+}\cdots \end{aligned}} | Sebelum tahun 1997 |  \mathbb {T}  |
| Tetapan Komornik–Loreti  |  {q} | 1.78723 16501 82965 93301  |  1=\!\sum _{n=1}^{\infty }{\frac {t_{k}}{q^{k}}}akar real dari  \prod _{n=0}^{\infty }\!\left(\!1{-}{\frac {1}{q^{2^{n}}}}\!\right)\!{+}{\frac {q{-}2}{q{-}1}}=0, dimana  t_{k} adalah barisan Thue–Morse. | 1998 |  \mathbb {T}  |
| Barisan lipatan kertas beraturan  |  {P_{f}} | 0.85073 61882 01867 26036  |  \sum _{n=0}^{\infty }{\frac {8^{2^{n}}}{2^{2^{n+2}}-1}}=\sum _{n=0}^{\infty }{\cfrac {\tfrac {1}{2^{2^{n}}}}{1-{\tfrac {1}{2^{2^{n+2}}}}}} | Sebelum tahun 1998 |  |
| Tetapan Artin  |  {C}_{\text{Artin}} | 0.37395 58136 19202 28805  |  \prod _{n=1}^{\infty }\left(1-{\frac {1}{p_{n}(p_{n}-1)}}\right)dimana  p_{n} adalah prima. | 1999 |  |
| Tetapan MRB  |  C_{\text{MRB}} | 0.18785 96424 62067 12024  |  \sum _{n=1}^{\infty }(-1)^{n}(n^{1/n}-1)=-{\sqrt[{1}]{1}}+{\sqrt[{2}]{2}}-{\sqrt[{3}]{3}}+\cdots  | 1999 |  |
| Tetapan perulangan kuadrat Somos  |  {\sigma } | 1.66168 79496 33594 12129  |  \prod _{n=1}^{\infty }n^{{1/2}^{n}}={\sqrt {1{\sqrt {2{\sqrt {3\cdots }}}}}}=1^{1/2}\;2^{1/4}\;3^{1/8}\cdots  | 1999 |  \mathbb {T} ? |