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Mathematics
Problem
Explain why, if two non-zero vectors
P
⃗
\vec P
P
and
Q
⃗
\vec Q
Q
satisfy
P
⃗
×
Q
⃗
=
0
⃗
\vec P \times \vec Q = \vec 0
P
×
Q
=
0
, the vectors must be parallel.
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