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1/4 + 1/16 + 1/64 + 1/256 + ⋯. In mathematics, the infinite series 1 4 + 1 16 + 1 64 + 1 256 + ⋯ is an example of one of the first infinite series to be summed in the history of mathematics; it was used by Archimedes circa 250–200 BC. [ 1] As it is a geometric series with first term 1 4 and common ...
6 1 2 1 1 −1 4 5 9. and would be written in modern notation as 6 1 / 4 , 1 1 / 5 , and 2 − 1 / 9 (i.e., 1 8 / 9 ). The horizontal fraction bar is first attested in the work of Al-Hassār (fl. 1200), [35] a Muslim mathematician from Fez, Morocco, who specialized in Islamic inheritance jurisprudence.
The name Jamshid is originally a compound of two parts, Jam and shid, corresponding to the Avestan names Yima and Xšaēta, derived from the Proto-Iranian *Yamah Xšaitah ('Yama, the brilliant/majestic'). [1] Yamah and the related Sanskrit Yama are interpreted as "the twin", perhaps reflecting an Indo-Iranian belief in a primordial Yama and ...
Map of provinces of Iran, 1937–1960. In 1937 the territory of Iran was divided into ten administrative regions: Region 1 , Region 2 , Region 10 , etc. For example, Region 7 or "Seventh Province" corresponded to present-day Fars Province per the "Territorial Subdivision Act of 1316 Š./1937 (Qānūn-e taqsīmāt-e kešvar)." [3]
Nuclear program of Iran. The P5+1 refers to the UN Security Council 's five permanent members (the P5); namely China, France, Russia, the United Kingdom, and the United States; plus Germany. The P5+1 is often referred to as the E3+3 by European countries. [1] It is a group of six world powers which, in 2006, joined together in diplomatic ...
Quarter-comma meantone, or 1 4 -comma meantone, was the most common meantone temperament in the sixteenth and seventeenth centuries, and was sometimes used later. In this system the perfect fifth is flattened by one quarter of a syntonic comma ( 81 : 80 ), with respect to its just intonation used in Pythagorean tuning ( frequency ratio 3 ...
In terms of partition, 20 / 5 means the size of each of 5 parts into which a set of size 20 is divided. For example, 20 apples divide into five groups of four apples, meaning that "twenty divided by five is equal to four". This is denoted as 20 / 5 = 4, or 20 / 5 = 4. [2] In the example, 20 is the dividend, 5 is the divisor, and 4 is ...
Geographer. Hipparchus (/ hɪˈpɑːrkəs /; Greek: Ἵππαρχος, Hípparkhos; c. 190 – c. 120 BC) was a Greek astronomer, geographer, and mathematician. He is considered the founder of trigonometry, [1] but is most famous for his incidental discovery of the precession of the equinoxes. [2] Hipparchus was born in Nicaea, Bithynia, and ...