deletions | additions       diff --git a/physical model1.tex b/physical model1.tex  index 38fc7a8..35b8b06 100644  --- a/physical model1.tex  +++ b/physical model1.tex 
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\item[Axiom 1] Sheep move away from dogs when sufficiently close.  \item[Axion 2] When two sheep are very close to each other, they want more space and move away.  \item[Axiom 3] When two sheep are neither too close, nor too far, they flock together.  \end{description} We translate these axioms into forces that are acting on the sheep. These forces then drive the sheep in a certain direction and define the speed at which the sheep moves.