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central correspondence differential elliptic envelope equations figure finland function group high historic integrals letter line logarithm low mail mapping mathematics message old philately point postage postcard postmark retro rhythmic science seal stamp system theory transformation trigonometry value vintageFunctions Theory Editorial Photo
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Title
Functions Theory #236586715
Description
FINLAND - CIRCA 1978: stamp printed by Finland, shows Figure of the Functions Theory, Rhythmic Group of Lines, circa 1978
This image is editorial
