Le Roy, Édouard Louis Emmanuel Julien (1870–1954)

Le Roy was a French mathematical physicist and Catholic modernist philosopher. Starting from a philosophy of life similar to Henri Bergson’s philosophy of creative evolution, he argued that the capacity for invention was fundamental to human existence. This led him to develop a radical form of conventionalism according to which scientific facts are created rather than discovered. Henri Poincaré attacked this view, arguing that the scientist creates only the language in which facts are expressed.