"absolute differential calculus" meaning in English

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          "text": "1926 [Blackie & Son], Marjorie Long (translator), Tullio Levi-Civita, The Absolute Differential Calculus (Calculus of Tensors), 1977, Dover https://books.google.com.au/books?id=8PzDAgAAQBAJ&printsec=frontcover&dq=%22absolute+differential+calculus%22&hl=en&newbks=1&newbks_redir=0&sa=X&ved=2ahUKEwi60s2Pq5DsAhX94zgGHf40DQ0Q6AEwAHoECAAQAg#v=onepage&q=%22absolute%20differential%20calculus%22&f=false."
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          "text": "1931 [Blackie Company], A. J. McConnell, Applications of Tensor Analysis, 1957, Dover, page v,\nThe absolute differential calculus came into prominence as the instrument best fitted for dealing with the general theory of relativity and it has also been found indispensable for the differential geometry of hyperspaces."
        },
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          "ref": "1999, Umberto Bottazzini, “8: Ricci and Levi-Civita: from differential invariants to general relativity”, in Jeremy Gray, editor, The Symbolic Universe: Geometry and Physics 1890-1930, Oxford University Press, page 241",
          "text": "Instead, it is of interest to try to look at the emergence of the absolute differential calculus (ADC in the rest of this chapter) from the viewpoint of the mathematical community of the time.",
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        "Ricci calculus; the rules of index notation and manipulation for tensors and tensor fields, as developed by Gregorio Ricci-Curbastro."
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  "word": "absolute differential calculus"
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          "text": "1926 [Blackie & Son], Marjorie Long (translator), Tullio Levi-Civita, The Absolute Differential Calculus (Calculus of Tensors), 1977, Dover https://books.google.com.au/books?id=8PzDAgAAQBAJ&printsec=frontcover&dq=%22absolute+differential+calculus%22&hl=en&newbks=1&newbks_redir=0&sa=X&ved=2ahUKEwi60s2Pq5DsAhX94zgGHf40DQ0Q6AEwAHoECAAQAg#v=onepage&q=%22absolute%20differential%20calculus%22&f=false."
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          "text": "1931 [Blackie Company], A. J. McConnell, Applications of Tensor Analysis, 1957, Dover, page v,\nThe absolute differential calculus came into prominence as the instrument best fitted for dealing with the general theory of relativity and it has also been found indispensable for the differential geometry of hyperspaces."
        },
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          "ref": "1999, Umberto Bottazzini, “8: Ricci and Levi-Civita: from differential invariants to general relativity”, in Jeremy Gray, editor, The Symbolic Universe: Geometry and Physics 1890-1930, Oxford University Press, page 241",
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