What is the source for Rabbis being able to say that one is not allowed to do a mitzvah deorita?
Examples that come to mind are blowing shofar on Rosh Hashana on Shabbat, lulav on Sukkot (at least first day) on Shabbat, and more.
Ideas?
What is the source for Rabbis being able to say that one is not allowed to do a mitzvah deorita?
Examples that come to mind are blowing shofar on Rosh Hashana on Shabbat, lulav on Sukkot (at least first day) on Shabbat, and more.
Ideas?
Apparently the of last four, $\ce{Mg^2+}$ is closest in radius to $\ce{Li+}$. Is this true, and if so, why would a whole larger shell ($\ce{...
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