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∀
Turned A (capital: Ɐ or Ɒ, lowercase: ɐ or ɒ) is a letter of the Latin alphabet based upon the letter A. It is not, nor has it ever been, used in any natural languages as a letter in its own right.
Lowercase ɐ (in two story form) is used in the International Phonetic Alphabet to identify the near-open central vowel. A variant, turned alpha, ɒ, is also used in the IPA as the open back rounded vowel.
It has been used in the 18th century by Edward Lhuyd and William Pryce as phonetic character for the Cornish language. In their books, both Ɐ and ɐ have been used. [1]
The symbol ∀ bears the same shape of a capital turned A, sans serif, and is used in mathematics and logic to identify universal quantification. In entertainment, the Japanese anime Turn A Gundam uses ∀ as part of both the title and the name of the titular mecha. In traffic engineering it is used to represent flow, the number of units (vehicles) passing a point in a unit of time.
[edit]Encodings
Ɐ is encoded in Unicode at U+2C6F Ɐ latin capital letter turned a (HTML: Ɐ) in the block Latin Extended-C, though very few fonts support it as of 2008, and ɐ is encoded in Unicode at U+0250 ɐ latin small letter turned a (HTML: ɐ) in the block IPA Extensions.
The similar turned alphas are at U+2C70 Ɒ latin capital letter turned alpha (HTML: Ɒ capital), and at U+0252 ɒ latin small letter turned alpha (HTML: ɒ).
The mathematical symbol ∀ is encoded at U+2200 ∀ for all (HTML: ∀ ∀), in the block Mathematical operators, and only in a sans-serif form.
The Symbol font includes ∀ at position 34 (which would produce the quotation mark in ASCII and Unicode).
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foliations.org
foliations.org is a resource site on the study and research into the theory of foliations and related topics, featuring essays and surveys articles, computer generator illustrations of examples, photo gallery of researchers, and online reference materials.
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Welcome to Maths Rally School
Maths Rally programme helps children master difficult mathematical concepts, enables children to excel at advanced levels according to individual mathematical ability through hands-on maths activities. Develops children’s mathematical problem solving skills.
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