Riemann’s Hypothesis, a Second_Three_Pages_Proof

After the very short and simple first proof of the RC (short for “Riemann Conjecture”), using the series expansion about z=1/2 of the Xi function Xi(z) and the Hilbert Spaces Theory, now the author provides a new, second, proof, using the same series expansion about z=1/2 of the Xi function Xi(z) and Algebra. This new proof is so simple that the author wonders why a great mathematician like Riemann did not see it; therefore F. Galetto thinks that somewhere in the purported proof there should be an error.