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Removed the 'edit' link and provided the actual link to the answer.
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Here's one.
That the golden ratio $(1+\sqrt5)/2$ was used in architecture and art before the 20th century. See this HEREMO post .

Here's one.
That the golden ratio $(1+\sqrt5)/2$ was used in architecture and art before the 20th century. See HERE .

Here's one.
That the golden ratio $(1+\sqrt5)/2$ was used in architecture and art before the 20th century. See this MO post .

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Gerald Edgar
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Here's one.
That the golden ratio $(1+\sqrt5)/2$ was used in architecture and art before the 20th century. See HERE .