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Other articles where open set is discussed: topology: Topological space: …sets in T are called open sets and T is called a topology on X. For example, the real number line becomes a topological space when its topology is specified as the collection of all possible unions of open intervals—such as (−5, 2), (1/2, π), (0, 2), …. (An analogous…
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Encyclopaedia Britannica Australia
Rosh Hashana, (Hebrew: “Beginning of the Year”) , Hashana also spelled Hashanah or Ha-shanah, also called Day of Judgment or Day of Remembrance, a major Jewish observance now accepted as inaugurating the religious New Year on Tishri 1 (September or October). Because the New Year ushers in a 10-day period of self-examination and penitence, Rosh Hashana is also called the annual Day of Judgment; during this period each Jew reviews his relationship with God, the Supreme Judge. A distinctive feature of the liturgy is the blowing of the ram’s horn (shofar) as prescribed in Numbers 29:1; the notes of the
