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The small ke is a Japanese character, typographically a small form of the katakana character ケ ke. [1] While identical in shape to a small ケ, ヶ is actually an abbreviation for the kanji 箇, specifically by writing half of the bamboo radical 竹 . 箇, alternatively written as 個 (or 个), is a common Japanese counter word.
This article will use the following notational conventions: matrices are represented by capital letters in bold, e.g. A; vectors in lowercase bold, e.g. a; and entries of vectors and matrices are italic (they are numbers from a field), e.g.
In geometry, an isosceles triangle (/ aɪ ˈ s ɒ s ə l iː z /) is a triangle that has two sides of equal length or two angles of equal measure. Sometimes it is specified as having exactly two sides of equal length, and sometimes as having at least two sides of equal length, the latter version thus including the equilateral triangle as a special case.
In mathematics, the infinite series 1 − 1 + 1 − 1 + ⋯, also written = is sometimes called Grandi's series, after Italian mathematician, philosopher, and priest Guido Grandi, who gave a memorable treatment of the series in 1703.