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Original · English

Calculus Made Easy

Chapter I

A little bit of. The sum of.

These dreadful symbols are:

(1) d which merely means “a little bit of.” Thus dx means a little bit of x; or du means a little bit of u. But you will find that these little bits (or elements) may be considered to be indefinitely small.

dx,du

(2) ∫ which is merely a long S, and may be called (if you like) “the sum of.” Thus ∫dx means the sum of all the little bits of x; or ∫dt means the sum of all the little bits of t.

∫dx,∫dt

The word “integral” simply means “the whole.” If you think of the duration of time for one hour, you may (if you like) think of it as cut up into 3600 little bits called seconds. The whole of the 3600 little bits added up together make one hour.

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Translation · European Spanish

El cálculo al alcance de todos

Capítulo I

Un poquito. La suma.

Estos temibles símbolos son:

(1) d, que solo significa «un poquito de». Así, dx es un poquito de x; du, un poquito de u. Pero verá que estos pequeños trozos (o elementos) pueden considerarse indefinidamente pequeños.

dx,du

(2) ∫, que no es más que una S alargada y puede llamarse, si lo desea, «la suma de». Así, ∫dx es la suma de todos los pequeños trozos de x; ∫dt, la de todos los de t.

∫dx,∫dt

La palabra «integral» significa simplemente «el todo». Puede imaginar una hora dividida en 3600 pequeños trozos llamados segundos. Todos esos 3600 trozos sumados forman una hora.

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What matters when translating a specific EPUB file

If you already have an EPUB file in hand, what matters most is a translation workflow that keeps the result readable as a book and easy to review before you keep it.

  1. Best for one-file EPUB translation jobs

    Useful when you already have the EPUB file and want a direct path to a translated reading copy.

  2. The file should stay readable after translation

    A strong result is a translated EPUB file you can keep reading, browse by chapter, and reopen later.

  3. Review still matters before you keep the file

    Users often want to inspect the translated EPUB on desktop before treating it as the version they will continue with.

  4. Useful when the task is centered on one EPUB file

    The important result is a translated EPUB you can review, save, reopen, and keep reading without losing the structure of the original file.