Oswald Veblen Quotes
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The branch of physics which is called Elementary Geometry was long ago delivered into the hands of mathematicians for the purposes of instruction. But, while mathematicians are often quite competent in their knowledge of the abstract structure of the subject, they are rarely so in their grasp of its physical meaning.
At the same time it will not be forgotten that the physical reality of geometry can not be put in evidence with full clarity unless there is an abstract theory also... Thus, for example, while the term electron may have more than one physical meaning, it is by no means such a protean object as a point or a triangle.