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Inequalities between $\mid A\mid + \mid B\mid $ and $\mid A^{*} \mid + \mid B^{*} \mid$
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Let $A$ and $B$ be complex square matrices. Some inequalities between $\mid A \mid + \mid B \mid$ and $\mid A^{*} \mid + \mid B^{*} \mid$ are established. Applications of these inequalities are also given. For example, in the Frobenius norm, $$ \parallel\, A+B \,\parallel_{F} \leq \sqrt[4]{2} \parallel \mid A\mid + \mid B\mid \, \parallel_{F}. $$
Title: Inequalities between $\mid A\mid + \mid B\mid $ and $\mid A^{*} \mid + \mid B^{*} \mid$
Description:
Let $A$ and $B$ be complex square matrices.
Some inequalities between $\mid A \mid + \mid B \mid$ and $\mid A^{*} \mid + \mid B^{*} \mid$ are established.
Applications of these inequalities are also given.
For example, in the Frobenius norm, $$ \parallel\, A+B \,\parallel_{F} \leq \sqrt[4]{2} \parallel \mid A\mid + \mid B\mid \, \parallel_{F}.
$$.
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