The ratio of the flow speed to the speed of sound was named the Mach number after Ernst Mach, who was one of the first to investigate the properties of supersonic flow which included Schlieren photography techniques to visualize the changes in density.

A contrasting position was taken by Ernst Mach, who contended that all motion was relative.

* 1916 – Ernst Mach, Austrian-Czech physicist and philosopher ( b. 1838 )

* 1838 – Ernst Mach, Austrian physicist ( d. 1916 )

Hayek's time in Monakow's lab, and his deep interest in the work of Ernst Mach, inspired Hayek's first intellectual project, eventually published as The Sensory Order ( 1952 ).

The main influences on the early logical positivists were the positivist Ernst Mach, Gottlob Frege, Bertrand Russell and the young Ludwig Wittgenstein.

Influential in the early days of Modernism were the theories of Sigmund Freud ( 1856 – 1939 ), and Ernst Mach ( 1838 – 1916 ).

As a philosopher of science Ernst Mach was a major influence on logical positivism, and through his criticism of Isaac Newton, a forerunner of Einstein's theory of relativity.

The Mach number is named after Austrian physicist and philosopher Ernst Mach, a designation proposed by aeronautical engineer Jakob Ackeret.

Some examples of this are Baruch Spinoza, David Hume, Ernst Mach, Richard Avenarius, and Joseph Petzoldt.

‪ File: Ernst Mach 01. jpg ‬‬| Ernst Mach ( 1838-1916 ): contributed the Mach number, studied shock waves and how airflow is disturbed at the speed of sound, influenced logical positivism, forerunner of Einstein ’ s relativity through his criticism of Newton ‬‬‬‬

* February 19 – Ernst Mach, Austrian physicist and philosopher ( b. 1838 )

* February 18 – Ernst Mach, Austrian physicist and philosopher ( d. 1916 )

* Ernst Mach

One of the major innovations made by the Salon Cubists, independently of Picasso and Braque, was that of simultaneity, drawing to greater or lesser extent on theories of Henri Poincaré, Ernst Mach, Charles Henry, and Henri Bergson.

The highpoint of the German University was the era preceding the First World War, when it was home to world-renowned scientists such as physicist and philosopher Ernst Mach, Moritz Winternitz, Albert Einstein.

# Janez Strnad, Ernst Mach kot fizik ( Ernst Mach as physicist ), ( Zbornik za zgodovino naravoslovja in tehnike 10, Ljubljana 1989 ).

A Critical Analysis of Complementary or Alternative Medicine, by Edzard Ernst ( Editor ) ( 2008 ), reviewed in Metapsychology.

It is named after Ernst Abbe ( 1840 – 1905 ), the German physicist who defined it.

Math., 1858 ) and Ernst Abbe showed that the properties of these reproductions, i. e. the relative position and magnitude of the images, are not special properties of optical systems, but necessary consequences of the supposition ( in Abbe ) of the reproduction of all points of a space in image points ( Maxwell assumes a less general hypothesis ), and are independent of the manner in which the reproduction is effected.

In 1899, the memorial, by the Berlin sculptor Ernst Gustav Herter ( 1846 – 1917 ), finally came to rest, although subject to repeated vandalism, in the Bronx, at 164th Street and the Grand Concourse, or Joyce Kilmer Park near today's Yankee Stadium.

< div style =" border: none ; width: 180px ;">< div class =" thumbcaption "> Ernst Haeckel ( left ) and Eugenius Warming ( right ), two founders of ecology </ div ></ div ></ div >

Ernst Heinrich Philipp August Haeckel ( February 16, 1834 – August 9, 1919 ),

As a philosopher, Ernst Haeckel wrote Die Welträtsel ( 1895 – 1899, in English, The Riddle of the Universe, 1901 ), the genesis for the term " world riddle " ( Welträtsel ); and Freedom in Science and Teaching to support teaching evolution.

Five years later ( 1937 ), the firm financed the work of Ernst Ruska and Bodo von Borries, and employed Helmut Ruska ( Ernst ’ s brother ) to develop applications for the microscope, especially with biologic specimens.

In Germany, Ernst Lubitsch got his inspiration from the stage work of Max Reinhardt, both in bourgeois comedy and in spectacle, and applied this to his films, culminating in his die Puppe ( The Doll ), die Austernprinzessin ( The Oyster Princess ) and Madame Dubarry.

In a ring all of whose ideals are principal ( a principal ideal domain or PID ), this ideal will be identical with the set of multiples of some ring element d ; then this d is a greatest common divisor of a and b. But the ideal ( a, b ) can be useful even when there is no greatest common divisor of a and b. ( Indeed, Ernst Kummer used this ideal as a replacement for a gcd in his treatment of Fermat's Last Theorem, although he envisioned it as the set of multiples of some hypothetical, or ideal, ring element d, whence the ring-theoretic term.

Cukor was then assigned to One Hour With You ( 1932 ), an operetta with Maurice Chevalier and Jeanette MacDonald, when original director Ernst Lubitsch opted to concentrate on producing the film instead.

* Sigismund Ernst Richard Krone ( 1861-1917 ), German naturalist.

Göring appointed his successor Albert Kesselring as CS and Ernst Udet head the Reich's Air Ministry Technical Office ( Technisches Amt ), although he was not a technical expert.

Image: Haeckel Actiniae. jpg | Sea anemones from Ernst Haeckel's Kunstformen der Natur ( Artforms of Nature ), 1904.

Ernst Krenek set Emmet Lavery's libretto Tarquin ( 1940 ), a version in a contemporary setting.

* Ernst Reuter ( 1889 – 1953 ), mayor of Magdeburg 1931-1933, then mayor of West Berlin from 1948 to 1953.

* Phantoms ( Toch ), a choral work by Ernst Toch

Among these were the killing of CEO of MTU Aero Engines, a German engineering company, Ernst Zimmermann ; another bombing at the US Air Force's Rhein-Main Air Base ( near Frankfurt ), which targeted the base commander and killed two bystanders ; the car bomb attack that killed Siemens executive Karl-Heinz Beckurts and his driver ; and the shooting of Gerold von Braunmühl, a leading official at Germany's foreign ministry.

* Trouble in Paradise ( 1932 ), d. Ernst Lubitsch

* Bluebeard's Eighth Wife ( 1938 ), d. Ernst Lubitsch

* Ninotchka ( 1939 ), d. Ernst Lubitsch

* That Uncertain Feeling ( 1941 ), d. Ernst Lubitsch

* 1900 – Wolfgang Ernst Pauli, Austrian physicist, Nobel Prize laureate ( d. 1958 )

* 1958 – Wolfgang Ernst Pauli, Austrian-born American physicist, Nobel laureate ( b. 1900 )

The German physicist Ernst Ruska and the electrical engineer Max Knoll constructed the prototype electron microscope in 1931, capable of four-hundred-power magnification ; the apparatus was a practical application of the principles of electron microscopy.

Murray Gell-Mann always referred to Feynman diagrams as Stueckelberg diagrams, after a Swiss physicist, Ernst Stueckelberg, who devised a similar notation many years earlier.

The German physicist, Ernst Florens Chladni, was the first to publish the then audacious idea that that meteorites were actually rocks from space.

* 1798 – Franz Ernst Neumann, German mineralogist and physicist ( d. 1895 )

Leading Jewish intellectuals on university faculties included physicist Albert Einstein ; sociologists Karl Mannheim, Erich Fromm, Theodor Adorno, Max Horkheimer, Herbert Marcuse ; philosophers Ernst Cassirer and Edmund Husserl ; political theorists Arthur Rosenberg and Gustav Meyer ; and many others.

** Ernst Messerschmid, German physicist and astronaut

* December 25 – Ernst Ruska, German physicist, Nobel laureate ( d. 1988 )

* February 2 – Jane Ising, widow of physicist Ernst Ising ( d. 2012 )

* April 25 – Wolfgang Ernst Pauli, Austrian-born physicist, Nobel Prize laureate ( d. 1958 )

* May 25 – Ernst Ruska, German physicist, Nobel Prize laureate ( b. 1906 )

His most important teacher was Ernst Karl Abbe ( 1840 – 1905 ) ( physicist, mathematician, and inventor ).

Ernst Mach () ( February 18, 1838 – February 19, 1916 ) was an Austrian physicist and philosopher, noted for his contributions to physics such as the Mach number and the study of shock waves.

Ernst August Friedrich Ruska ( 25 December 1906 – 27 May 1988 ) was a German physicist who won the Nobel Prize in Physics in 1986 for his work in electron optics, including the design of the first electron microscope.