# Families of Two-Point Touching Squares

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This Demonstration shows two-point touching families of squares. The number of squares and the tilt angle can be varied.

Contributed by: Izidor Hafner (April 2019)

Open content licensed under CC BY-NC-SA

## Snapshots

## Details

A family is said to be -touching provided each element of has a nonempty intersection with exactly other elements of . A -touching family is said to be point--touching if any two touching sets have only a single common point [1].

Reference

[1] B. Grünbaum, "Families of Point-Touching Squares," *Geombinatorics*, 12(4), 2003 pp. 167–174.

## Permanent Citation