English: The symbol of the empty set is not originated from the Greek alphabet phi, but the Norwegian alphabet Ø.
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myself
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{{Information |Description=The symbol of the empty set is not originated from the Greek alphabet phi, but the Norwegian alphabet Ø. 空集符號並非取自希臘字母ϕ,而是挪威語字母Ø。 |Source=own work |Date=29/09/2007 |Author=myself |Perm
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