Difference quotients and smoothness: (a conjecture of Keith Stroyan)
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1969 ◽
Vol 18
(3)
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pp. 233-247
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2000 ◽
Vol 37
(2)
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pp. 238-249
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2013 ◽
Vol 765-767
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pp. 620-624
1981 ◽
Vol 28
(3)
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pp. 327-359
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