Standard Notations for Sets of Numbers

Standard Notations for Sets of Numbers

ℕ    -     Natural Number

ℕ_k   -     Natural Numbers less than or equal to k

I      -     Integers

I₀      -     Integers excluding 0

ℤ     -     Integers

ℤ⁺   -     Positive Integers

ℤ^-    -     Negative Integers

ℚ    -     Rational Numbers

ℚ⁺     -     Positive Rational Numbers

ℚ₀     -     Non-zero Rational Numbers

ℝ     -     Real Numbers

ℝ⁺    -     Positive Real Numbers

ℝ₀    -     Non-zero Real Numbers

ℂ     -     Complex Numbers

ℂ₀   -     Non-zero Complex Numbers

W    -     Whole Numbers