## equality

Equality holds $\langle$occurs$\rangle$ in (9) if ......

......, with equality if $a=1$.

There is equality if $a=1$.

Equality is achieved only for $a=1$.

Then $a\le b\le c\le a$. We therefore have equality throughout.

The relation becomes an equality if the $w_i$ form an orthonormal basis.

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