The demonstration that I did and that I show below, is proposed in the book Calculus Infinitesimal, of Michael Spivak. The exercise corresponds to number 21 of the prologue to Chapter I, entitled Basic Number Properties.
Source:
Infinitesimal calculus. 2nd Edition. Michael Spivak. University of Brandeis. Editorial Reverté, SA. 1992. Barcelona, Spain.
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Justo lo que vi en mi primer semestre de calculo :) ... Sufrí con ese libro!!! Porque en la preparatoria realmente no te ponen a desmostar algo, fue mi primer acercamiento a lo que era la formalidad de las matemáticas.
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Saludos @elnoob2014. Gracias por tu mensaje.
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