„One should clearly distinguish between two aspects of the estimation problem:“

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Rudolf Kalman Fotografia
Rudolf Kalman
amerykański matematyk pochodzenia węgierskiego 1930 - 2016
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„Through the darkness of future past, the magician longs to see, one chance out between two worlds, fire walk with me!“

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„Between every two pine trees there is a door leading to a new way of life.“

— John Muir Scottish-born American naturalist and author 1838 - 1914
Muir's marginal note in volume I of Prose Works by Ralph Waldo Emerson (This volume is located at the Beinecke Rare Book and Manuscript Library of Yale University. See Albert Saijo, "Me, Muir, and Sierra Nevada", in Reinhabiting a Separate Country: A Bioregional Anthology of Northern California, edited by Peter Berg, San Francisco, California: Planet Drum Foundation, 1978, pages 52-59, at page 55, and Frederick W. Turner, Rediscovering America: John Muir in His Time and Ours (1985), page 193.)

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„One ever feels his twoness, -- an American, a Negro; two souls, two thoughts, two unreconciled strivings; two warring ideals in one dark body, whose strenth alone keeps it from being torn asunder.“

— W.E.B. Du Bois, The Souls of Black Folk
Context: After the Egyptian and Indian, the Greek and Roman, the Teuton and Mongolian, the Negro is a sort of seventh son, born with a veil, and gifted with second-sight in this American world, — a world which yields him no true self-consciousness, but only lets him see himself through the revelation of the other world. It is a peculiar sensation, this double-consciousness, this sense of always looking at one's self through the eyes of others, of measuring one's soul by the tape of a world that looks on in amused contempt and pity. One ever feels his twoness, — an American, a Negro; two warring souls, two thoughts, two unreconciled strivings; two warring ideals in one dark body, whose dogged strength alone keeps it from being torn asunder.The history of the American Negro is the history of this strife, — this longing to attain self-conscious manhood, to merge his double self into a better and truer self. Ch. I: Of Our Spiritual Strivings

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— Joseph Stalin General secretary of the Communist Party of the Soviet Union 1878 - 1953

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