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This was a famous mistake made by Lebesgue (see also Gerald Edgar's answer to this MO question). Suslin showed that a plane Borel set of type exists whose projection is not a Borel set. See the references to the original article by Suslin and related works here. |
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This was a famous mistake made by Lebesgue (see also Gerald Edgar's answer to this MO question). Suslin showed that a plane Borel set of type exists whose projection is not a Borel set. See the references to the original article by Suslin and related works here. |
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Suslin showed that a plane Borel set of type exists whose projection is not a Borel set. See the references to the original article by Suslin and related works here. |
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