[v_4,l_4]=?, where v_4 is the Hopf map in \pi_7(S^4) and l_4 is the generator of \pi_4(S^4) which represent the identity map, [,] is whitehead product.
[v_4,l_4]=?, v_4 is the Hopf map in \pi_7(S^4) and l_4 is the generator of \pi_4(S^4)
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