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  2. List of emoticons - Wikipedia

    en.wikipedia.org/wiki/List_of_emoticons

    A simple smiley. This is a list of emoticons or textual portrayals of a writer's moods or facial expressions in the form of icons.Originally, these icons consisted of ASCII art, and later, Shift JIS art and Unicode art.

  3. Electrocardiography - Wikipedia

    en.wikipedia.org/wiki/Electrocardiography

    The earliest sign is hyperacute T waves, peaked T waves due to local hyperkalemia in ischemic myocardium. This then progresses over a period of minutes to elevations of the ST segment by at least 1 mm. Over a period of hours, a pathologic Q wave may appear and the T wave will invert. Over a period of days the ST elevation will resolve.

  4. Science and technology in Venezuela - Wikipedia

    en.wikipedia.org/wiki/Science_and_technology_in...

    In 1902 with only 19 old he dedicated to study of mathematics, doing a work on the sign π up to 200 decimal digits, presented to the Academy of Sciences of Paris in 1907. Graduated in 1908 in the Central University of Venezuela as civil engineer, later served as professor of geometry (1909–1911) and infinitesimal calculus (1936–1939).

  5. Corner detection - Wikipedia

    en.wikipedia.org/wiki/Corner_detection

    Corner detection is an approach used within computer vision systems to extract certain kinds of features and infer the contents of an image. Corner detection is frequently used in motion detection, image registration, video tracking, image mosaicing, panorama stitching, 3D reconstruction and object recognition.

  6. Quaternion - Wikipedia

    en.wikipedia.org/wiki/Quaternion

    Constraining any such multiplication table to have the identity in the first row and column and for the signs of the row headers to be opposite to those of the column headers, then there are 3 possible choices for the second column (ignoring sign), 2 possible choices for the third column (ignoring sign), and 1 possible choice for the fourth ...

  7. Germany - Wikipedia

    en.wikipedia.org/wiki/Germany

    Germany, [e] officially the Federal Republic of Germany, [f] is a country in Central Europe.It lies between the Baltic and North Sea to the north and the Alps to the south. Its sixteen constituent states have a total population of over 83 million in an area of 357,569 km 2 (138,058 sq mi), making it the most populous member state of the European Union.

  8. Spinor - Wikipedia

    en.wikipedia.org/wiki/Spinor

    A spinor visualized as a vector pointing along the Möbius band, exhibiting a sign inversion when the circle (the "physical system") is continuously rotated through a full turn of 360°. [ a ] In geometry and physics, spinors (pronounced "spinner" IPA / s p ɪ n ər / ) are elements of a complex number -based vector space that can be associated ...