show/hide this revision's text 4 it seems this info is only available in the comments.

Let $X$ be a CW-complex with

  • one 0-cell
  • two 1-cells
  • three 2-cells
  • no cells in dimensions 3 or higher.

Is it always true that $\pi_2(X)\ne 1$?

show/hide this revision's text 3 edited tags
show/hide this revision's text 2 New tags
show/hide this revision's text 1