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2. Square-free integer - Wikipedia

   en.wikipedia.org/wiki/Square-free_integer

   An integer is square-free if and only if it is equal to its radical. Every positive integer can be represented in a unique way as the product of a powerful number (that is an integer such that is divisible by the square of every prime factor) and a square-free integer, which are coprime.

3. Square-free element - Wikipedia

   en.wikipedia.org/wiki/Square-free_element

   In mathematics, a square-free element is an element r of a unique factorization domain R that is not divisible by a non-trivial square. This means that every s such that s 2 ∣ r {\displaystyle s^{2}\mid r} is a unit of R .

4. List of number fields with class number one - Wikipedia

   en.wikipedia.org/wiki/List_of_number_fields_with...

   On the other hand, the maximal real subfields Q(cos(2π/2 n)) of the 2-power cyclotomic fields Q(ζ 2 n) (where n is a positive integer) are known to have class number 1 for n≤8, [8] and it is conjectured that they have class number 1 for all n. Weber showed that these fields have odd class number.

5. List of number theory topics - Wikipedia

   en.wikipedia.org/wiki/List_of_number_theory_topics

   Square root of two; Quadratic irrational; Integer square root; Algebraic number. Pisot–Vijayaraghavan number; Salem number; Transcendental number. e (mathematical constant) pi, list of topics related to pi; Squaring the circle; Proof that e is irrational; Lindemann–Weierstrass theorem; Hilbert's seventh problem; Gelfond–Schneider theorem ...

6. Glossary of number theory - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_number_theory

   square-free integer A square-free integer is an integer that is not divisible by any square other than 1. square number A square number is an integer that is the square of an integer. For example, 4 and 9 are squares, but 10 is not a square. Szpiro Szpiro's conjecture is, in a modified form, equivalent to the abc conjecture.

7. Quadratic field - Wikipedia

   en.wikipedia.org/wiki/Quadratic_field

   Every such quadratic field is some () where is a (uniquely defined) square-free integer different from and . If d > 0 {\displaystyle d>0} , the corresponding quadratic field is called a real quadratic field , and, if d < 0 {\displaystyle d<0} , it is called an imaginary quadratic field or a complex quadratic field , corresponding to whether or ...