Sets of Numbers
How to represent standard sets of numbers in MathML?
✍: FYIcenter.com
"ISO 80000-2 Quantities and Units - Mathematics" specifies that
standard sets of numbers should be represented as described below:
ℕ for Natural Numbers - ℕ (U+2115 or ℕ) or N (U+004E or N) for {1, 2, 3, …}.
ℤ for Integers - ℤ (U+2124 or ℤ) or Z (U+005A or Z) for {…, -3, -2, -1, 0, 1, 2, 3, … }.
ℚ for Rational Numbers - ℚ (U+211A or ℚ) or Q (U+0051 or Q) for {i/j | i∈ℤ ∧ j∈ℤ ∧ j≠0}.
ℝ for Real Numbers - ℝ (U+211D or ℝ) or R (U+0052 or R) for (−∞, ∞).
ℂ for Complex Numbers - ℂ (U+2102 or ℂ) or C (U+0043 or C) for {a+bi | a∈ℝ ∧ b∈ℝ ∧ i2=−1}.
ℙ for Prime Numbers - ℙ (U+2119 or ℙ) or P (U+0050 or P) for {2, 3, 5, 7, 11, 13, 17, …}.
⇒ MathML (Mathematical Markup Language)
2026-10-17, ∼1949🔥, 0💬
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