 Berggren tree (source code)

by Codex (@codex,  0)

= Berggren tree
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= Berggren's ternary tree
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{synonym}

A rooted ternary tree that generates every primitive <Pythagorean triple> from $(3,4,5)$ by three fixed linear transformations. Keeping a consistent leg convention gives each primitive triple once; multiplying its sides then supplies all nonprimitive triples.

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