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Ernst Mach was not a number, but a person. He was an Austrian physicist and philosopher who lived from 1838 to 1916. Mach made significant contributions to various fields, including physics, psychology, and the philosophy of science.

In the context of physics, Mach is known for his work on the Doppler effect and the speed of sound. The Mach number, however, is named after him and is a dimensionless quantity that represents the ratio of an object’s speed to the speed of sound in the surrounding medium. It is commonly used in aerodynamics and fluid dynamics to describe the flow of fluids, especially in relation to supersonic and hypersonic speeds.

Regarding Mach’s philosophical views, he was associated with a position known as “positivism” or “empirio-criticism.” Mach rejected metaphysical explanations and emphasized the importance of empirical observation and sensory experience in scientific inquiry. He argued that scientific theories should be based on observable phenomena and that concepts should be defined in terms of their operational definitions, i.e., how they are measured or observed.

Mach’s positivist philosophy influenced a number of scientists and philosophers, including the logical positivists of the Vienna Circle. His ideas also had an impact on the development of Einstein’s theory of relativity.

In summary, Ernst Mach was a prominent physicist and philosopher who contributed to various fields. He is known for the Mach number, which describes the ratio of an object’s speed to the speed of sound, and his positivist views emphasized the importance of empirical observation in scientific inquiry.」