# "Mass and energy can neither be created nor be destroyed." But if it is true then during a nuclear fusion or fission reaction how is mass converted to energy. In this case the mass is being reduced and energy is being increased.

"Mass and energy can neither be created nor be destroyed."
But if it is true then during a nuclear fusion or fission reaction how is mass converted to energy. In this case the mass is being reduced and energy is being increased. I know that it is due to the equation $E= mc^2$.
But does this violate the above quote?
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klofnu7c2
Let us put
${a}_{n}:=\frac{{e}^{n}}{n!}\phantom{\rule{thickmathspace}{0ex}}⟹\phantom{\rule{thickmathspace}{0ex}}\frac{{a}_{n+1}}{{a}_{n}}=\frac{{e}^{n+1}}{\left(n+1\right)!}\frac{n!}{{e}^{n}}=\frac{e}{n+1}\underset{n\to \mathrm{\infty }}{\overset{}{\to }}0$
Thus, the series converges absolutely and thus it also converges, i.e.:
$\sum _{n=1}^{\mathrm{\infty }}\frac{{e}^{n}}{n!}\phantom{\rule{thickmathspace}{0ex}}\phantom{\rule{thickmathspace}{0ex}}\text{converges}\phantom{\rule{thickmathspace}{0ex}}⟹\phantom{\rule{thickmathspace}{0ex}}\sum _{n=1}^{\mathrm{\infty }}\left(-1{\right)}^{n}\frac{{e}^{n}}{n!}\phantom{\rule{thickmathspace}{0ex}}\phantom{\rule{thickmathspace}{0ex}}\text{also converges}$