# Recent history for David Speyer

2
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ago
 posted an answer What is the symbol of a differential operator?
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 received upvote on answer What is the symbol of a differential operator?
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 received upvote on answer What is the symbol of a differential operator?
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 received upvote on answer What is the symbol of a differential operator?
4
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ago
 answer commented on Flux through a Mobius strip
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 posted a comment Flux through a Mobius strip
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 answer commented on Flux through a Mobius strip
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