3. Write the following statements in symbolic language and prove each of them: (a) for all r ER, √5-r and √5 +r cannot both be rational. (1) n. Al CAL C CAL C

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3. Write the following statements in symbolic language and prove each of them:
(a) for all r ER, √5-r and √5+r cannot both be rational.
(b) Every prime number p € P>3 is either of the form of 4n+ 1 or of the form of 4n +3
for some n EN
(c) If x is irrational and y is rational then xy is irrational.
Transcribed Image Text:3. Write the following statements in symbolic language and prove each of them: (a) for all r ER, √5-r and √5+r cannot both be rational. (b) Every prime number p € P>3 is either of the form of 4n+ 1 or of the form of 4n +3 for some n EN (c) If x is irrational and y is rational then xy is irrational.
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