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ERIC Number: EJ789617
Record Type: Journal
Publication Date: 2008-Apr
Pages: 5
Abstractor: Author
Reference Count: 1
ISBN: N/A
ISSN: ISSN-0020-739X
A Proof of the Collatz Conjecture
Bruckman, Paul S.
International Journal of Mathematical Education in Science and Technology, v39 n3 p403-407 Apr 2008
An elementary proof by contradiction of the Collatz Conjecture (CC) (also known as the "3X + 1" Conjecture), is presented. A modified form of the Collatz transformation is formulated, leading to the concept of a modified Collatz chain. A smallest counterexample N[subscript 0] is hypothesized; the existence of N[subscript 0] implies that N[subscript 0] must generate an infinite sequence {N[subscript k]}, each of whose elements is at least as large as N[subscript 0]. A formula for N[subscript k] is derived, in terms of an auxiliary sequence {E[subscript k]} and the starting value N[subscript 0]. It is shown that each E[subscript k] satisfies k [less than or equal] E[subscript k] less than 1.585k; this, in turn, leads us to conclude that N[subscript 0] is unbounded, which is a contradiction of its definition, thereby establishing CC.
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Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A