@skyfits_heaven Ma uno può vivere la sua vita come vuole lui o deve rendere conto a te? E chi ti dice che al ragazzo non stia bene così? Se non ti va di andare a letto con altri, non farlo! Il moralismo con la vita privata degli altri è pensoso.
@Rainmaker1973 This is actually dangerous. Fainting is physiological response to hypoxia (lack of oxygen) to the brain: lying down restores the blood flow to the brain. Keeping someone upright when they're about to faint can prolong the hypoxia and cause permanent brain damage!
@sonukg4india For the eigenvalue 5 the only choice normal eigenvecctor {1;1;1}/√3. The eigenspace of 2 is bidemensional and so multiple choices are possible, for example {-1;0:1}/√2 and {-1;2;-1}/√6. These three vectors are the columns of P and the P^-1 is its transpose.
@Math_files So when we take the square root of -1, it can mean either i or -i, it is inherently multivalued, unlike the square root defined for the positive numbers. /end
@Math_files ALL equations stay exactly the same if we exchange all i's with -i's (i.e. we take the conjugate of every complex number in a equation). We know there are 2 square roots of -1, we know they are each other's opposite, but there is no way to decide which is i and which is -i. 2/n