A Combinatorial Proof That Σ k<sup>3</sup> = (Σ k)<sup>2</sup> (Q5616176)

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scientific article; zbMATH DE number 3339448
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A Combinatorial Proof That Σ k&lt;sup&gt;3&lt;/sup&gt; = (Σ k)&lt;sup&gt;2&lt;/sup&gt;
scientific article; zbMATH DE number 3339448

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    A Combinatorial Proof That Σ k&lt;sup&gt;3&lt;/sup&gt; = (Σ k)&lt;sup&gt;2&lt;/sup&gt; (English)
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    1971
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