Signes més i menys (Catalan Wikipedia)

Analysis of information sources in references of the Wikipedia article "Signes més i menys" in Catalan language version.

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Christian-Jewish Dialogue: Theological Foundations By Peter von der Osten-Sacken (1986 – Fortress Press) ISBN 0-8006-0771-6 "In Israel the plus sign used in mathematics is represented by a horizontal stroke with a vertical hook instead of the sign otherwise used all over the world, because the latter is reminiscent of a cross." (Page 96)