Allen's non-realizability conjecture for unknown pairs of T(2,n)

For an odd positive integer nn, consider a torus knot T(2,n)T(2,n) and the pairs (e,h)(e,h) of normal Euler number and first Betti number of smooth surfaces in B4B^4 bounded by T(2,n)T(2,n). The theorem in the source identifies a collection of pairs whose realizability is unknown: if n1(mod4)n\equiv 1\pmod 4, (e,h)=(42n+2m,1+m)(e,h)=(4-2n+2m,1+m) for 0m<n10\leq m<n-1; if n3(mod4)n\equiv 3\pmod 4, (e,h)=(82n+2m,3+m)(e,h)=(8-2n+2m,3+m) for 0m<n30\leq m<n-3. Allen's non-realizability conjecture. All unknown points in that collection are not realizable. The paper provides counterexamples for T(2,5)T(2,5) and T(2,9)T(2,9), so this conjecture is refuted.

Sources & referencesView supporting material

Primary source

Kouki Sato, “Counterexamples to Allen's conjectures”, arXiv:2407.12049 (2024).

Progress summary

Never refreshed

Nothing recorded yet. Refresh searches the literature and the public web for attempts on this problem, and writes the first summary here.

Solutions 0

No solutions have been posted yet.