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.

Element Default Rendering Meaning
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)
infinity Infinity
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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