Email Communication Patterns Among Students in a Classroom Setting: A Comparison

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If there exists a difference between the two following sentences, could someone tell me of this difference?

"Every student in class sends email to some student in class."

and

"Some student in class is sent emails by everyone in class."

To be frank, I don't see any difference in meaning.
 
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Bashyboy said:
If there exists a difference between the two following sentences, could someone tell me of this difference?

"Every student in class sends email to some student in class."

and

"Some student in class is sent emails by everyone in class."

To be frank, I don't see any difference in meaning.

It is a question of semantics. In the first case, I wouldn't assume that eveyone sends email to the same student. In the second case it is clear a particular student received all the emails.

If I told a class that eveyone in class must write to someone in Congress, would you assume they would all write to the same person?
 
Ooh, very profound! I thank you very much for elucidating this for me.
 
Prove $$\int\limits_0^{\sqrt2/4}\frac{1}{\sqrt{x-x^2}}\arcsin\sqrt{\frac{(x-1)\left(x-1+x\sqrt{9-16x}\right)}{1-2x}} \, \mathrm dx = \frac{\pi^2}{8}.$$ Let $$I = \int\limits_0^{\sqrt 2 / 4}\frac{1}{\sqrt{x-x^2}}\arcsin\sqrt{\frac{(x-1)\left(x-1+x\sqrt{9-16x}\right)}{1-2x}} \, \mathrm dx. \tag{1}$$ The representation integral of ##\arcsin## is $$\arcsin u = \int\limits_{0}^{1} \frac{\mathrm dt}{\sqrt{1-t^2}}, \qquad 0 \leqslant u \leqslant 1.$$ Plugging identity above into ##(1)## with ##u...

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