Which of the following physicists advocated for positivism as a fundamental philosophy for science and as an anti-realist reportedly said, "Have you ever seen one?" while debating the legitimacy of atoms?

Question

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Ernst Mach was a physicist who advocated for positivism and anti-realism in science. He famously debated the existence of atoms and reportedly asked his opponents, "Have you ever seen one?" in reference to the inability to directly observe atoms.

Which of the Following Physicists Advocated for Positivism as a Fundamental