A note on the Hopf homomorphism of a Toda bracket and its application

The suspension order of the real even dimensional projective space

“…and so H(δη 6 p 7 ) = ĩ6 η 6 p 7 . By use of a generalized version [9] of [20,Proposition 2.2] and by the fact that H(ν ) = η 5 [20, (5.3)] for H : π 3 6 → π 5 6 , we obtain…”