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| rev | Bot | (Created page with "<div class="d-none"><math> \newcommand{\mathds}{\mathbb}</math></div>Prove that an operator <math>T\in B(H)</math> satisfies the condition <math display="block"> < Tx,x > \geq0 </math> for any <math>x\in H</math> precisely when it is positive in our sense, <math>\sigma(T)\subset[0,\infty)</math>.") | Apr 20'25 at 1:31 | +298 |