Differentiable functions defined in closed sets. I.
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Publication:5924346
DOI10.2307/1989844zbMath60.0217.02OpenAlexW4253130156MaRDI QIDQ5924346
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Publication date: 1934
Published in: Transactions of the American Mathematical Society (Search for Journal in Brave)
Full work available at URL: https://doi.org/10.2307/1989844
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