Daftar tetapan matematis
Abad ke-19

| Nama | Simbol | Ekspansi desimal | Rumus | Tahun | Himpunan |
| --- | --- | --- | --- | --- | --- |
| Tetapan Ramanujan–Soldner |  {\mu } | 1.45136 92348 83381 05028  |  \mathrm {li} (x)=\int \limits _{0}^{x}{\frac {dt}{\ln t}}=0Akar dari fungsi integral logaritmik. | 1812 |  |
| Tetapan Hermite  |  \gamma _{_{2}} | 1.15470 05383 79251 52901  |  {\frac {2}{\sqrt {3}}}={\frac {1}{\cos \,({\frac {\pi }{6}})}} | 1822 hingga  1901 |  \mathbb {A}  |
| Bilangan Liouville  |  {\text{£}}_{\text{Li}} |  0.11000 10000 00000 00000 0001  |  \sum _{n=1}^{\infty }{\frac {1}{10^{n!}}}={\frac {1}{10^{1!}}}+{\frac {1}{10^{2!}}}+{\frac {1}{10^{3!}}}+{\frac {1}{10^{4!}}}+\cdots  | Sebelum tahun 1844 |  \mathbb {T}  |
| Hermite–Ramanujan constant |  {R} | 262 53741 26407 68743   .99999 99999 99250 073  |  e^{\pi {\sqrt {163}}} | 1859 |  \mathbb {T}  |
| Tetapan Catalan |  {C} | 0.91596 55941 77219 01505  |  \int _{0}^{1}\!\!\int _{0}^{1}\!\!{\frac {1}{1{+}x^{2}y^{2}}}\,\mathrm {d} x\,\mathrm {d} y=\!\sum _{n=0}^{\infty }\!{\frac {(-1)^{n}}{(2n{+}1)^{2}}}\!=\!{\frac {1}{1^{2}}}{-}{\frac {1}{3^{2}}}{+}{\cdots } | 1864 |  \mathbb {T} ? |
| Bilangan Dottie  |  d | 0.73908 51332 15160 64165  |  \lim _{x\to \infty }\cos ^{[x]}(c)=\lim _{x\to \infty }\underbrace {\cos(\cos(\cos(\cdots (\cos(c)))))} _{x} | 1865 |  \mathbb {T}  |
| Tetapan Meissel–Mertens  |  {M} | 0.26149 72128 47642 78375  |  \lim _{n\rightarrow \infty }\!\!\left(\sum _{p\leq n}{\frac {1}{p}}\!-\ln(\ln(n))\!\right)\!\!={\underset {\!\!\!\!\gamma :\,{\text{tetapan Euler}},\,\,p:\,{\text{prima}}}{\!\gamma \!+\!\!\sum _{p}\!\left(\!\ln \!\left(\!1\!-\!{\frac {1}{p}}\!\right)\!\!+\!{\frac {1}{p}}\!\right)}} | 1866 dan 1873 |  \mathbb {T} ? |
| Tetapan Weierstrass  |  \sigma \left({\frac {1}{2}}\right) | 0.47494 93799 87920 65033  |  {\frac {e^{\frac {\pi }{8}}{\sqrt {\pi }}}{4\cdot 2^{3/4}{({\frac {1}{4}}!)^{2}}}} | 1872 ? |  |
| Tetapan Hafner–Sarnak–McCurley (2)  |  {\frac {1}{\zeta (2)}} | 0.60792 71018 54026 62866  |  {\frac {6}{\pi ^{2}}}=\prod _{n=0}^{\infty }{\underset {p_{n}:{\text{ prime}}}{\!\left(\!1-{\frac {1}{{p_{n}}^{2}}}\!\right)}}\!=\!\textstyle \left(1\!-\!{\frac {1}{2^{2}}}\right)\!\left(1\!-\!{\frac {1}{3^{2}}}\right)\!\left(1\!-\!{\frac {1}{5^{2}}}\right)\cdots  | 1883 |  \mathbb {T}  |
| Tetapan Cahen  |  \xi _{2} | 0.64341 05462 88338 02618  |  \sum _{k=1}^{\infty }{\frac {(-1)^{k}}{s_{k}-1}}={\frac {1}{1}}-{\frac {1}{2}}+{\frac {1}{6}}-{\frac {1}{42}}+{\frac {1}{1806}}{\,\pm \cdots } Dimana  s_{k} adalah suku ke- k dari barisan Sylvester 2, 3, 7, 43, 1807, ...Didefinsikan sebagai:   \,\,S_{0}=\,2,\,\,S_{k}=\,1+\prod \limits _{n=0}^{k-1}S_{n}{\text{ untuk}}\;k>0 | 1891 |  \mathbb {T}  |
| Tetapan parabolik semesta  |  {P}_{\,2} | 2.29558 71493 92638 07403  |  \ln(1+{\sqrt {2}})+{\sqrt {2}}\;=\;\operatorname {arcsinh} (1)+{\sqrt {2}} | Sebelum 1891 |  \mathbb {T}  |
| Tetapan Apéry  |  \zeta (3) | 1.20205 69031 59594 28539  |  {\begin{aligned}\sum _{n=1}^{\infty }{\frac {1}{n^{3}}}&={\frac {1}{1^{3}}}+{\frac {1}{2^{3}}}+{\frac {1}{3^{3}}}+{\frac {1}{4^{3}}}+{\frac {1}{5^{3}}}+\cdots \\&={\frac {1}{2}}\sum _{i=1}^{\infty }\sum _{j=1}^{\infty }{\frac {1}{ij(i{+}j)}}\\&=\!\!\int \limits _{0}^{1}\!\!\int \limits _{0}^{1}\!\!\int \limits _{0}^{1}{\frac {\mathrm {d} x\,\mathrm {d} y\,\mathrm {d} z}{1-xyz}}\end{aligned}} | 1895 |  \mathbb {R} \setminus \mathbb {Q}   \mathbb {T} ? |
| Tetapan Gelfond  |  {e}^{\pi } | 23.14069 26327 79269 0057  |  (-1)^{-i}=i^{-2i}=\sum _{n=0}^{\infty }{\frac {\pi ^{n}}{n!}}=1+{\frac {\pi ^{1}}{1}}+{\frac {\pi ^{2}}{2}}+{\frac {\pi ^{3}}{6}}+\cdots  | 1900 |  \mathbb {T}  |