We show a few nontrivial extensions in the classical Adams spectral sequence. In particular, we compute that the –primary part of is . This was the last unsolved –extension problem left by the recent work of Isaksen and the authors through the –stem.
The proof of this result uses the technique, which was introduced by the authors to prove . This paper advertises this technique through examples that have simpler proofs than in our previous work.
"Some extensions in the Adams spectral sequence and the $51$–stem." Algebr. Geom. Topol. 18 (7) 3887 - 3906, 2018. https://doi.org/10.2140/agt.2018.18.3887