Mathematicians have found 17 different ways to fill the plane with patterns that repeat in two directions. They claim that is all of them! Are these really all different? Could it be all of them? Experiment, and decide for yourself.
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BeakUnit: Skeletal Cuboctahedron (12 units)
Interactive Impedance Figure
Function Transformation Tool
Logistic Growth Model Vs. Exponential Model
Second derivative test