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<p>which preserve <a href="page.php?w=algebraic_structure">algebraic structure</a>s; <a href="page.php?w=continuous_function">continuous function</a>s, which preserve topological structures; and <a href="page.php?w=differentiable_function">differentiable function</a>s, which preserve differential structures.</p>

<p><big>History</big></p>
<p>In 1939, the French group with the pseudonym "<a href="page.php?w=Nicolas_Bourbaki">Nicolas Bourbaki</a>" saw structures as the root of mathematics. They first mentioned them in their "Fascicule" of Theory of Sets and</p><p>
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