See (Miranda 1955, p. 1, 1970, p. 2). Miranda, Carlo (1955). Equazioni alle derivate parziali di tipo ellittico (in Italian). Springer. MR0087853. Zbl0065.08503. Translated as Miranda, Carlo (1970). Partial Differential Equations of Elliptic Type. Translated by Motteler, Zane C. (2nd ed.). Springer. MR0284700. Zbl0198.14101.
Precisely, in the first edition of his monograph, Miranda (1955, p. 1) uses the Italian term "campo", meaning literally "field" in a way similar to its meaning in agriculture: in the second edition of the book, Zane C. Motteler appropriately translates this term as "region". Miranda, Carlo (1955). Equazioni alle derivate parziali di tipo ellittico (in Italian). Springer. MR0087853. Zbl0065.08503. Translated as Miranda, Carlo (1970). Partial Differential Equations of Elliptic Type. Translated by Motteler, Zane C. (2nd ed.). Springer. MR0284700. Zbl0198.14101.
Hahn (1921, p. 61 footnote 3), commenting the just given definition of open set ("offene Menge"), precisely states:-"Vorher war, für diese Punktmengen die Bezeichnung "Gebiet" in Gebrauch, die wir (§ 5, S. 85) anders verwenden werden." (Free English translation:-"Previously, the term "Gebiet" was occasionally used for such point sets, and it will be used by us in (§ 5, p. 85) with a different meaning." Hahn, Hans (1921). Theorie der reellen Funktionen. Erster Band [Theory of Real Functions, vol. I] (in German). Springer. JFM48.0261.09.
Hahn (1921, p. 61 footnote 3), commenting the just given definition of open set ("offene Menge"), precisely states:-"Vorher war, für diese Punktmengen die Bezeichnung "Gebiet" in Gebrauch, die wir (§ 5, S. 85) anders verwenden werden." (Free English translation:-"Previously, the term "Gebiet" was occasionally used for such point sets, and it will be used by us in (§ 5, p. 85) with a different meaning." Hahn, Hans (1921). Theorie der reellen Funktionen. Erster Band [Theory of Real Functions, vol. I] (in German). Springer. JFM48.0261.09.
See (Miranda 1955, p. 1, 1970, p. 2). Miranda, Carlo (1955). Equazioni alle derivate parziali di tipo ellittico (in Italian). Springer. MR0087853. Zbl0065.08503. Translated as Miranda, Carlo (1970). Partial Differential Equations of Elliptic Type. Translated by Motteler, Zane C. (2nd ed.). Springer. MR0284700. Zbl0198.14101.
Precisely, in the first edition of his monograph, Miranda (1955, p. 1) uses the Italian term "campo", meaning literally "field" in a way similar to its meaning in agriculture: in the second edition of the book, Zane C. Motteler appropriately translates this term as "region". Miranda, Carlo (1955). Equazioni alle derivate parziali di tipo ellittico (in Italian). Springer. MR0087853. Zbl0065.08503. Translated as Miranda, Carlo (1970). Partial Differential Equations of Elliptic Type. Translated by Motteler, Zane C. (2nd ed.). Springer. MR0284700. Zbl0198.14101.