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Full-Text Articles in Mathematics
Observationes De Theoremate Quodam Fermatiano Aliisque Ad Numeros Primos Spectantibus, Leonhard Euler
Observationes De Theoremate Quodam Fermatiano Aliisque Ad Numeros Primos Spectantibus, Leonhard Euler
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Euler shows that the fifth Fermat number, 225 +1 = 4,294,967,297, is not prime because it is divisible by 641, though he does not give any clues about how he discovered this fact. He also tacks on a few "theorems" but says that he does not yet know how to prove them.
De Formis Radicum Aequationum Cuiusque Ordinis Coniectatio, Leonhard Euler
De Formis Radicum Aequationum Cuiusque Ordinis Coniectatio, Leonhard Euler
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For an equation of degree n, Euler wants to define a "resolvent equation" of degree n-1 whose roots are related to the roots of the original equation. Thus, by solving the resolvent one can solve the original equation. In sections 2 to 7 he works this out for quadratic, cubic, and biquadratic equations. In section 8 Euler says that he wants to try the same approach for solving the quintic equation and general nth degree equations. In the rest of the paper he tries to figure out in what cases resolvents will work.
Specimen De Constructione Aequationum Differentialium Sine Indeterminatarum Separatione, Leonhard Euler
Specimen De Constructione Aequationum Differentialium Sine Indeterminatarum Separatione, Leonhard Euler
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In this paper, Euler investigates a differential equation that he encountered in finding the arc length of an ellipse. This differential equation cannot be solved by separation of variables, as is indicated in the title of the article. Euler first develops a formula for the arc length of an ellipse by cleverly manipulating a binomial series, then shows that this formula satisfies the desired differential equation. Integrating factors make a brief appearance.
Quomodo Data Quacunque Curva Inveniri Oporteat Aliam Quae Cum Data Quodammodo Iuncta Ad Tautochronismum Producendum Sit Idonea, Leonhard Euler
Quomodo Data Quacunque Curva Inveniri Oporteat Aliam Quae Cum Data Quodammodo Iuncta Ad Tautochronismum Producendum Sit Idonea, Leonhard Euler
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No abstract provided.
De Curvis Rectificabilibus Algebraicis Atque Traiectoriis Reciprocis Algebraicis, Leonhard Euler
De Curvis Rectificabilibus Algebraicis Atque Traiectoriis Reciprocis Algebraicis, Leonhard Euler
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No abstract provided.
Constructio Aequationis Differentialis AxN Dx = Dy + Y2 Dx, Leonhard Euler
Constructio Aequationis Differentialis AxN Dx = Dy + Y2 Dx, Leonhard Euler
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No abstract provided.
De Solutione Problematum Diophanteorum Per Numeros Integros, Leonhard Euler
De Solutione Problematum Diophanteorum Per Numeros Integros, Leonhard Euler
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Euler searches for integer solutions to axx+bx+c=yy and considers some applications to figurate numbers.
De Progressionibus Transcendentibus Seu Quarum Termini Generales Algebraice Dari Nequeunt, Leonhard Euler
De Progressionibus Transcendentibus Seu Quarum Termini Generales Algebraice Dari Nequeunt, Leonhard Euler
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No abstract provided.
De Indorum Anno Solari Astronomico, Leonhard Euler
De Indorum Anno Solari Astronomico, Leonhard Euler
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This work is an appendix following two other appendices in a book by Euler's friend and St. Petersbrg Academy colleague T. S. Bayer, Historia regni Graecorum Bactriani (History of the Bactrian kingdom of the Greeks). The original appendices were written by a Danish missionary in Tranquebar, C. T. Walther ("The Indian Doctrine of Time," pp. 145-190), and by Bayer himself, based on his correspondence with Walther and other Tranquebar missionaries ("Supplement to the Indian Doctrine of Time," pp. 191-200). Euler's contribution appears immediately after these.
De Communicatione Motus In Collisione Corporum, Leonhard Euler
De Communicatione Motus In Collisione Corporum, Leonhard Euler
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No abstract provided.
De Summatione Innumerabilium Progressionum, Leonhard Euler
De Summatione Innumerabilium Progressionum, Leonhard Euler
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This paper concerns the sum of reciprocal squares, which equals π2/6. Euler does not yet have the tools to find this value directly, but instead approximates it as 1.644934. He says this follows from E25 and E19, and also refers us forward to E736. Then Euler brings in the harmonic series: letting f(x) denote the xth partial sum of the harmonic series, he approximates it as an integral and defines his constant γ as the limit of f(x) – log(x).
Solutio Singularis Casus Circa Tautochronismum, Leonhard Euler
Solutio Singularis Casus Circa Tautochronismum, Leonhard Euler
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No abstract provided.
Problematis Isoperimetrici In Latissimo Sensu Accepti Solutio Generalis, Leonhard Euler
Problematis Isoperimetrici In Latissimo Sensu Accepti Solutio Generalis, Leonhard Euler
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No abstract provided.