Android ASP Astrology Bitcoin Blowfish Built-in C# Calendar CD-DVD Chinese Cryptography DES Encoding Ethereum Flash GB2312 General H History Java JavaScript JDBC JSP JVM Movie Music MySQL Perl PHP Physics PKI Reference REST SOAP Sorting Swing UML Unicode VBScript Web Web-Services Windows WSDL XML XMLPad XSD XSL-FO

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Let (a,b)=(4,2), what is a-b?

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Android ASP Astrology Bitcoin Blowfish Built-in C# Calendar CD-DVD Chinese Cryptography DES Encoding Ethereum Flash GB2312 General H History Java JavaScript JDBC JSP JVM Movie Music MySQL Perl PHP Physics PKI Reference REST SOAP Sorting Swing UML Unicode VBScript Web Web-Services Windows WSDL XML XMLPad XSD XSL-FO