A ladder is a disc diagram whose blocks form a linear chain, each block a two-cell or a connecting edge, with cells attached successively along interior arcs. Its boundary consists of two opposite side paths between its ends. Every cell meets both side paths. If cell perimeters are bounded by , each point of one side is within of the other by traveling around a cell boundary; connecting edge paths coincide on the two sides.

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  1. Disc diagram
  2. 2-complex
  3. CW complex
  4. Algebraic topology
  5. Geometry and topology
  6. Area of mathematics
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