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A smooth $n$-manifold $N$ is called parallelizable if it admits $n$ smooth vector fields $Y_1;\ :\ :\ :\ ;\ Y_n$ that are linearly independent at every point $p$ in $M$.

How would I show if if $N_1, \ldots, N_k$ are parallelizable manifolds, then so is $N_1\times\cdots\times N_k$?

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    Use that $T(N_1 \times \cdots \times N_k) = TN_1 \times \cdots \times TN_k$. Where do you see a problem?2011-10-27
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    Do it for two factors and use induction, to keep things minimally annoying.2011-10-27

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