\Rightarrow vs. \implies, and "does not imply" symbol - TeX - LaTeX
https://tex.stackexchange.com/questions/47063/rightarrow-vs-implies-and-does-not-imply-symbol
webTo answer your first question, you should use \implies, not \Rightarrow. \Rightarrow is far too small to give a readable result and is not spaced properly. Knuth specially defined \iff to be used for equivalence and \implies is the same but for implication (from the amsmath package). An implication is not a relation like > and, therefore, needs ...
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