Probably The Simplest Hypothesis... Is That There

To The Pure Geometer The Radius Of Curvature Is An Incidental Characteristic - Like The Grin Of The Cheshire Cat. To The Physicist It Is An Indispensable Characteristic. It Would Be Going Too Far To Say That To The Physicist The Cat Is Merely Incidental To The Grin. Physics Is Concerned With Interrelatedness Such As The Interrelatedness Of Cats And Grins. In This Case The "cat Without A Grin" And The "grin Without A Cat" Are Equally Set Aside As Purely Mathematical Phantasies.

Whatever Else There May Be In Our Nature, Responsibility Toward Truth Is One Of Its Attributes.

It Is One Thing For The Human Mind To Extract From The Phenomena Of Nature The Laws Which It Has Itself Put Into Them; It May Be A Far Harder Thing To Extract Laws Over Which It Has No Control. It Is Even Possible That Laws Which Have Not Their Origin In The Mind May Be Irrational, And We Can Never Succeed In Formulating Them.

The Mathematics Is Not There Till We Put It There.

Electrical Force Is Defined As Something Which Causes Motion Of Electrical Charge; An Electrical Charge Is Something Which Exerts Electric Force.