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How to declare vectors for solving

• To: mathgroup at smc.vnet.net
• Subject: [mg106456] How to declare vectors for solving
• From: John Rivers <first10 at btinternet.com>
• Date: Wed, 13 Jan 2010 05:58:13 -0500 (EST)

currently I do this:

a = {ax, ay, az};
b = {bx, by, bz};

then I can work with Cross[a, b] etc.

and then Solve[]

is there a way to declare a as a vector with 3 elements - but not give
values?