Ernst Mach (February 18, 1838 – February 19, 1916) was an Austrian people physicist and philosopher and is the namesake for the "Mach number" (aka Mach speed) and the optical illusion known as Mach bands.
Ernst Mach was born in Chrlice (now part of Brno), Czech Republic. There he studied mathematics, physics and philosophy, and received a doctorate in physics in 1860. His early work was focused on Doppler effect in optics and acoustics. In 1864 he took a job as profess
A movement that we will to execute is never more than a represented movement, and appears in a different domain from that of the executed movement, which always takes place when the image is vivid enough.
I have always felt it as a stroke of special good fortune, that early in life, at about the age of fifteen, I lighted, in the library of my father, on a copy of Kant's Prolegomena to any Future Metaphysics.
It may easily become a disturbing element in unprejudiced scientific theorising when a conception which is adapted to a particular and strictly limited purpose is promoted in advance to be the foundation of all investigation.
My coat may receive a stain, a tear. My very manner of expressing this shows that we are concerned here with a sum-total of permanency, to which the new element is added and from which that which is lacking is subsequently taken away.
My table is now brightly, now dimly lighted. Its temperature varies. It may receive an ink stain. One of its legs may be broken. It may be repaired, polished, and replaced part by part. But, for me, it remains the table at which I daily write.