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<p>of the <a href="page.php?w=virtually_Haken_conjecture">virtually Haken conjecture</a>, which was published a year later.  The conjecture (now theorem) states that every aspherical 3-manifold is finitely covered by a <a href="page.php?w=Haken_manifold">Haken manifold</a>.</p>

<p>In 2022, he posted on the <a href="page.php?w=ArXiv">ArXiv</a> a proof of <a href="page.php?w=Cameron_Gordon_%28mathematician%29">Cameron Gordon</a>'s 1981 conjecture on <a href="page.php?w=knot_theory">knot theory</a> saying that ribbon concordance forms a partial ordering</p><p>
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