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2013-03-09 16:36:59 +0100 received badge  Teacher (source)
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2013-03-07 00:50:02 +0100 answered a question only get 1 arrow using

nevermind.

Q=arrow3d((0,1,-1), (1,2,0), color="green") P=arrow3d((0,1,0), (2,3,1), color="red") show(P+Q, figsize=5)

works. from: http://sagemath.wikispaces.com/line3d

2013-03-07 00:33:05 +0100 asked a question only get 1 arrow using
Q=arrow3d((0,1,-1), (1,2,0), color="green")
P=arrow3d((0,1,0), (2,3,1), color="red")
P,Q;