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I've seen this kind of thing on many sites, that the "Fundamental Theorem of Engineering" is

$$\pi=3=e$$

Some of them said this is just a joke.

Well, I know $\pi=3,1415926\ldots$ and $e=2,7128128459045\ldots$

Then, what is the idea behind what did they thinking about?

Is this about "Rounding Numbers"?

Blue
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user516076
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    The joke is that engineers are not precise. Physicists are not always rigorous, and mathematicians are punctilious. – Doug M Oct 17 '19 at 04:35
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    Physicists have more or less the same saying -- google "spherical cow" – John Forkosh Oct 17 '19 at 04:53
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    Can't help recalling this. – metamorphy Oct 17 '19 at 06:23
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    Check the decimal expansion of $e$ , two eights are missing. – Peter Oct 22 '19 at 18:01
  • @MaxChan I agree, but off-topic questions are far more upvoted many times and moreover receive many answers , also upvoted many times than down- or close- or even delete-voted. Maybe, as a side note, it is worth mentioning that in the USA around $1900$ (I do not remember the exact year) , $\pi$ has been defined by law as $4$ , which should be less accurate than any approximation that is used in practice. – Peter Oct 22 '19 at 18:08
  • I know! Roman defines pi as 3 1/8 or even 4 sometimes! – Max Chan Oct 22 '19 at 23:10

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