What is it that breathes fire into the equations and makes a universe for them to describe? The usual approach of science of constructing a mathematical model cannot answer the questions of why there should be a universe for the model to describe. Why does the universe go to all the bother of existing?
A Brief History of Time Chapter 11 (p. 174)
Holton, Gerald Roller, Duane H.D.
Without the clear understanding that equations in physical science always have hidden limitations, we cannot expect to interpret or apply them successfully. For instance, we would continually be tempted to make unwarranted extrapolations and interpolations. We would be in the catastrophic position of a navigator who has to negotiate a rocky channel without having any idea of the length, width, and draft of his ship.
Foundations of Modern Physical Science Chapter I (pp. 4-5)
The difference between the sun's position and the position where the sun ought to be if it were a decent, self-respecting sun is called the Equation of Time.
The Cruise of the Snark Chapter 14 (p. 244)
Saaty, Thomas L.
Equations are the lifeblood of applied mathematics and science.
Modern Nonlinear Equations Preface (p. vii)
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