Capture filter question

[Marco Zuppone <msz () msz it>]

Hello,

I have a question about capture filters.
I noticed that the basic capture filter predefined in Wireshark to do not capture arp and DNS requests is defined in 
this way:
not arp and port not 53

What is the difference with: not arp and not port 53?

Thanks in advance
 Marco - StockTrader
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