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| portrait = Alfred C. Weed, in beard and stiff hat - 3000.33.2904.jpg

...mbol{l_2})-3( \mathbf{ \hat{u}_{12}\cdot } d\boldsymbol{ l_1} )(\mathbf{ \hat{u}_{12} \cdot}d\boldsymbol{l_2})\right ) \ , </math> ...boldsymbol{l_1 \cdot} d\boldsymbol{l_2})\mathbf{\hat{u}_{12}}-( \mathbf{ \hat{u}_{12}\cdot } d\boldsymbol{ l_1} )d\boldsymbol{l_2}\right ) \ , </math>

An '''ethical''' or "'''white hat'''" '''hacker''' is an expert in information technology security who does n }}</ref> These terms contrast with those of a "black hat" or non-ethical hacker.

...thbf{s}} \times \vec{\mathbf{r}} = \hat{\mathbf{e}} \,r\sin\alpha\, ds = \hat{\mathbf{e}}\, R\,ds, where <math>\scriptstyle \hat{\mathbf{e}} </math> is a unit vector along <math>\scriptstyle \mathbf{B}</m

S = - k_\mathrm{B} \mathrm{Tr}[\hat{\rho} \log {\rho}] where the density operator <math>\hat{\rho}</math> is given by

:<math>\hat H = - \frac{\hbar^2}{2\mu} \nabla^2,</math> :<math>\hat H =- \frac{\hbar^2}{2I} \left [ {1 \over \sin \theta} {\partial \over \part

...h>\hat p^n \psi</math> refers to iterative application of operator <math>\hat p</math> to the state <math>\psi</math>.

Y^m_\ell(\hat{\mathbf{r}}) \quad\hbox{with} \quad \hat{\mathbf{r}} \equiv \frac{\mathbf{r}}{|\mathbf{r}|}. \mathcal{R} Y^m_\ell(\hat{\mathbf{r}}) \equiv Y^m_\ell(\mathbf{R}^{-1} \hat{\mathbf{r}}).

...e similar to Hasidic dress, including a long coat and a ''shtreimel'' (fur hat) on [[Shabbos]] and holidays.

\mathcal{R}(\hat{\mathbf{n}}, \phi) = e^{-i \phi\, \hat{\mathbf{n}}\cdot \mathbf{l}} ...}</math> represents a rotation around the unit vector <math>{\scriptstyle \hat{\mathbf{n}} }</math> over an angle &phi; and '''l''' &equiv; (''l''<sub>''

:<math>R_{\hat{\mathbf u}}(\theta) = e^{i\theta {\hat{\mathbf u}}\mathbf{\cdot \boldsymbol{ \sigma}}/2} . </math>

{{Image|HatTossNavalAcademy.JPG|framt|250px|Graduation Hat Toss}}

...now is Director of the [[Defense Intelligence Agency]] and wears a "second hat" as commander of the Joint Functional Component Command for Intelligence,

* Hat Tricks

...mathematics, we may encounter the "hat notation" : <math> \hat{ \imath }, \hat{ \jmath }, \ldots </math>

\Phi(t) = A \mathbf{B}\cdot \hat{\mathbf{n}} = A B \cos\alpha(t) = \Phi(0)\cos\alpha(t), where <math>\scriptstyle \hat{\mathbf{n}} </math> is a unit vector normal (perpendicular) to the plane ''

The addition of MySQL in Red Hat Linux 7 in September of 2000 was a significant event in the increasing popu

*''The Man in the Green Hat'', 1955

::Personally, I would say that there are Citizens hat simply do not care if warnings appear on their talk pages. That would, inci

(As is often done, the "hat" over the letter ε indicates an observable ''estimate'' of an unobservable