Regarding the table of $SO(n)$s-of-origin in Davis+Mahowald (if you can get MathSciNet), is there a good reason that it should take longer for $\pi_{15}(SO)$ to be representable than $\pi_{19}(SO)$, which is already fully representable in $SO(11)$?
Take the 2-minute tour
×
MathOverflow is a question and answer site for professional mathematicians. It's 100% free, no registration required.