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… A particle, on the other hand, has discrete properties which it carries with it. And so the remarkable thing was the discovery, in investigations of various atomic phenomena, of an apparent paradox.

— Julian Schwinger Prologue in Quantum Mechanics: Symbolism of Atomic Measurements (2001)

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More quotes by Julian Schwinger

Perhaps the most important contribution to science that the Royal Society has made in its three centuries of existence is its early role in publishing Newton's masterful account of his discoveries: Mathematical Principles of Natural Philosophy—the Principia.

Einstein's Legacy: The Unity of Space and Time (2002)

Is the purpose of theoretical physics to be no more than a cataloging of all the things that can happen when particles interact with each other and separate? Or is it to be an understanding at a deeper level in which there are things that are not directly observable (as the underlying quantized fields are) but in terms of which we shall have a more fundamental understanding?

Quantum Mechanics - Symbolism of Atomic Measurements (2001)

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