Constants and symbols
(Excerpt from "The MathML Handbook" by Pavi Sandhu)
Several elements represent commonly used constants (such as π, ∞, e, or i) and symbols (such as those used to denote the set of all integers or the set of all complex numbers). A list of all content elements of this type is given in the following table.
Table: Content elements that represent constants and symbols.
|pi||π||The ratio of a circle's circumference to its diameter (approx. 3.141592653)|
|exponentiale||e||The base of the natural logarithm|
|imaginaryi||i||The (imaginary) square root of -1|
|notanumber||NaN||Not a number|
|true||true||The Boolean value True|
|false||false||The Boolean value False|
|emptyset||An empty set|
|eulergamma||γ||Euler's constant (approx. 0.5772156649)|
|integers||Z||The set of all integers|
|reals||R||The set of all real numbers|
|rationals||Q||The set of all rational numbers|
|naturalnumbers||N||The set of all natural numbers|
|complexes||C||The set of all complex numbers|
|primes||P||The set of all prime numbers|
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