Mathematical constants
About 120 notable mathematical constants — π, e, the golden ratio, Euler's γ, Apéry's ζ(3), Feigenbaum's δ and many more — with symbol, decimal value, the year or period first described, and whether each is known to be rational, algebraic or a period. One row per constant.
Columns
Stable keys — use them in the API, SQL and code
| Key | Name | Type | Description |
|---|---|---|---|
| name | Constant | string | — |
| symbol | Symbol | string | — |
| value | Value | number | Decimal value (double precision); blank when only bounds are known or the value is complex. |
| decimal_expansion | Decimal expansion | string | Digits as listed in the source, or the known bounds. |
| year | Year | year | First year given for the constant's discovery or description (negative = BCE). |
| year_text | Year described | string | Year or period as written in the source. |
| rational | Rational | boolean | Known to be a rational number (ℚ); blank if unknown. |
| algebraic | Algebraic | boolean | Known to be an algebraic number (𝔸); false means proven transcendental; blank if unknown. |
| period | Period | boolean | Known to be a period in the Kontsevich–Zagier sense (𝒫); blank if unknown. |
| exponential_period | Exponential period | boolean | Known to be an exponential period (ℰ𝒫); blank if unknown. |
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