Abbreviated Form
If several sets are being multiplied together, e.g. X1, X2, X3, …, then some authors choose to abbreviate the Cartesian product as simply ×Xi.
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Famous quotes containing the word form:
“Whoever denies that he possesses vanity generally possesses it in so brutal a form that he instinctively shuts his eyes in its presence, so as not to have to look down upon himself.”
—Friedrich Nietzsche (1844–1900)