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<p>used in <a href="page.php?w=homological_algebra">homological algebra</a>. He contributed to <a href="page.php?w=Hilbert%27s_program">Hilbert's program</a> in the <a href="page.php?w=foundations_of_mathematics">foundations of mathematics</a> by providing a <a href="page.php?w=constructive_mathematics">constructive</a> <a href="page.php?w=consistency_proof">consistency proof</a> for a weak system of arithmetic. The proof uses the above-mentioned, proof-theoretic Herbrand's theorem.</p>

<p><big>Biography</big></p>
<p>Herbrand finished his doctorate at <a href="page.php?w=%C3%89cole_Normale_Sup%C3%A9rieure">École Normale Supérieure</a></p><p>
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