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            <title xml:lang="en">Topological rigidity as a monoidal equivalence</title>
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                <title xml:lang="en">Topological rigidity as a monoidal equivalence</title>
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                <term xml:lang="en">finite duality</term>
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                <term xml:lang="en"> topological basis</term>
                <term xml:lang="en">Topological dual space</term>
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              <p>A topological commutative ring is said to be rigid when for every set $X$, the topological dual of the $X$-fold topological product of the ring is isomorphic to the free module over $X$. Examples are fields with a ring topology, discrete rings, and normed algebras. Rigidity translates into a dual equivalence between categories of free modules and of ``topologically-free'' modules and, with a suitable topological tensor product for the latter, one proves that it lifts to an equivalence between monoids in this category (some suitably generalized topological algebras) and some coalgebras. In particular, we provide a description of its relationship with the standard duality between algebras and coalgebras, namely finite duality.</p>
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