Quark Content and Isospin
Up and down quarks each have isospin I = 1⁄2, and isospin 3-components (I3) of 1⁄2 and −1⁄2 respectively. All other quarks have I = 0. In general
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“People disparage knowing and the intellectual life, and urge doing. I am content with knowing, if only I could know.”
—Ralph Waldo Emerson (1803–1882)