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-   -   x^2 = 2 , is it true? (https://www.mersenneforum.org/showthread.php?t=20801)

Ale 2015-12-31 07:20

x^2 = 2 , is it true?
 
italian Language :

Secondo me esiste un numero razionale tale che x^2 = 2 ed è la radice quadrata di 0,2 che è 0,4472135955 , mi spiego meglio 2 e 0,2 rappresentano entrambi due unità ,
quindi x^2 = 2 è possibile perché chiede 2 unità e non il numero 2 inteso come numero intero , quindi 0,4472135955^2 = 0,2 = che appunto sono 2 unità , cosa ne pensate ?

Google translate :

I think there is a rational number such that x ^ 2 = 2 and is the square root of 0.2 that is 0.4472135955, I'll explain 2 and 0.2 are both two units,
then x ^ 2 = 2 is possible because it requires 2 units and the number 2 is understood as an integer, then 0.4472135955 ^ 2 = 0.2 = 2 units that are in fact, what you think ?

LaurV 2015-12-31 08:40

0.4472135955^2=0.20000000000003762025.
Try again.

Ale 2015-12-31 08:49

Google calculator is 0,2

0.2 = 2/10 of units?
2 = two units ?

but is Always two

LaurV 2015-12-31 09:01

Google calculator is a part of a world conspiracy, to cheat you. They want you to be stupid, so they can lead you easier. Take the pencil and multiply by yourself.

Ale 2015-12-31 09:10

thank you very much

Ale 2015-12-31 11:26

[TEX](sqrt ({0.2*10}))[/TEX][SUP]^2[/SUP] = 2

science_man_88 2015-12-31 13:20

[QUOTE=Ale;420673][TEX](sqrt ({0.2*10}))[/TEX][SUP]^2[/SUP] = 2[/QUOTE]

you do realize that all this does is cancel the sqrt and square symbols.

Ale 2015-12-31 21:05

Sorry , yes

jux 2015-12-31 22:39

[QUOTE=LaurV;420661]Google calculator is a part of a world conspiracy, to cheat you. They want you to be stupid, so they can lead you easier. Take the pencil and multiply by yourself.[/QUOTE]

Not just Google, but the accursed IEEE and their "floating point formats", aka introducing hidden errors everywhere to slow down technological progress!

ewmayer 2016-01-01 02:19

Ah, nothing like a hilarious joke-thread to end the year with.

Continuing with the good fun, OP banned until he satisfactorily completes the elementary proof of the irrationality of sqrt(2) along the lines which I PMed him (this is still very basic, but different than the 'classical' ancient-Greek-era proof, to ensure he can't just copy/paste an answer.) I cc'ed the other mods on my ban-PM to him containing his un-ban homework assignment. Consider it incentivization to actually learn some basic maths.

NBtarheel_33 2016-01-02 12:01

Come on now, everybody knows that [TEX]X^2 = 100[/TEX]. Don't you know [I]anything[/I] about Roman numerals?


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