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Ladder

Eulerian paths — the ladder

One essay so far against this idea. A ladder is the distinct arguments that stand against one idea, and this one has room to grow.
  1. Königsberg as a graph. The four landmasses as circles and the seven bridges as edges; every circle has an odd number of edges.

    Seven bridges, and the invention of throwing things away

    Euler solved a puzzle about a Prussian city by deleting the city. What survived the deletion was a new branch of mathematics.

    rung 1 · discrete

All ladders