- The concept of a curve. Mapping of [0,1] onto [0,1]
^{2}. - Menger-Urysohn dimension of a space at a point.
- Universal spaces (in general).
- Universal Menger's compacta. Their Bestvina's characterization.
- Nöbeling's examples. (?).
- Embeddability of a curve in a surface. Planability. Two Kuratowski's graphs and two Claytor's curves. Embeddability of a locally connected continuum in the plane.