Examples of using Mathbf in English and their translations into Spanish
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Solution: We get the variable$\mathbf{y}$ in the first equation.
Mathbf{SST}$ is the total sum of squares for the dependent variable.
The operator D v/ D t{\displaystyle D\mathbf{v}/Dt} is the material derivative.
Mathbf{\Sigma}$ is a rectangle matrix with nonnegative real numbers on the diagonal.
Love waves are a special solution( u{\displaystyle\mathbf{u}}) that satisfy this system of equations.
N{\displaystyle\mathbf{N}} matrix of shape functions serving as interpolation functions.
Finally, when both scators,have scalar component equal zero,$a_{0}=0, b_{0}= 0$ namely,$\ overset{ o}\ alpha={ a}_{ l}{\hat{\mathbf{ e}}_{ l}}$ and$\ overset{ o}\ beta={ b_{ j}\ hat{\ mathbf{ e}}_{ j.
Let q{\displaystyle\mathbf{q}} be the vector of nodal displacements of a typical element.
In formulas, this is the set{( x, y)∈ R 2:∑ i 1 n( x- u i) 2+( y- v i) 2 d}.{\displaystyle\ left\{( x,y)\ in\ mathbf{ R}^{ 2}:\ sum_{ i=1}^{ n}{\ sqrt{( x-u_{ i})^{ 2}+( y-v_{ i})^{ 2}}}= d\ right\}.} The 1-ellipse is the circle.
Mathbf{W}$ is the matrix of eigenvectors of the covariance matrix$\mathbf{X} \mathbf{X}{\rm T.
For a collection of N point particles, the scalar moment of inertia I about the origin is defined by the equation I∑ k 1 N m k| r k| 2∑ k 1 N m k r k 2{\displaystyle I=\sum_{ k=1}^{ N}m_{ k}\ left|\ mathbf{r}_{ k}\ right|^{ 2}=\ sum_{ k=1}^{ N} m_{ k} r_{ k}^{ 2}} where mk and rk represent the mass and position of the kth particle.
If we were to represent L{\displaystyle\mathbf{L}} with respect to the stationary space-fixed frame, we would find time independent expressions for its components.
The effect of the quarter-wave plate is to introduce a phase shift term eiΓ =eiπ/2 i between the f and s components of the wave, so that upon exiting the crystal the wave is now given by( E f f^+ i E s s^)e i( k z- ω t).{\displaystyle( E_{ f}\ mathbf{\ hat{ f}}+ iE_{ s}\ mathbf{\ hat{ s}})\ mathrm{ e}^{i(kz-\omega t)}.} The wave is now elliptically polarized.
Q{\displaystyle 1_{\mathbf{Q}}} is not Riemann-integrable on: No matter how the set is partitioned into subintervals, each partition contains at least one rational and at least one irrational number, because rationals and irrationals are both dense in the reals.
As with the band structure itself,the Fermi surface can be displayed in an extended-zone scheme where k{\displaystyle\mathbf{k}} is allowed to have arbitrarily large values or a reduced-zone scheme where wavevectors are shown modulo 2 π a{\textstyle{\frac{2\pi}{a}}}(in the 1-dimensional case) where a is the lattice constant.
For the backwards vector,T n.{\ displaystyle\ mathbf{ T}^{ n}{\ begin{ bmatrix} 0\\{\ vec{ b}}^{ n-1}\\\ end{ bmatrix}}={\ begin{ bmatrix} t_{ 0}&\ dots& t_{ -n+2}& t_{ -n+1}\\\ vdots&\&\&\\\ t_{ n-2}&\&\ mathbf{ T}^{ n-1}&\\\ t_{ n-1}&\&\&\ end{ bmatrix}}{\ begin{ bmatrix}\ \\0\\\\\{\ vec{ b}}^{ n-1}\\\\\\ end{ bmatrix}}={\ begin{ bmatrix}\ epsilon_{ b}^{ n} \\0\\\vdots \\0\\1\end{ bmatrix}}.} As before, the extra column added to the matrix does not perturb this new backwards vector; but the extra row does.
This wave can be written as( E f f^+ E s s^)e i( k z- ω t),{\displaystyle( E_{ f}\ mathbf{\ hat{ f}}+ E_{ s}\ mathbf{\ hat{ s}})\ mathrm{ e}^{i(kz-\omega t)},} where the f and s axes are the quarter-wave plate's fast and slow axes, respectively, the wave propagates along the z axis, and Ef and Es are real.
This can be expressed as:V E⋅ L E L cos τ v B L cos τ{\ displaystyle V=\ mathbf{ E}\ cdot\ mathbf{ L}= EL\ cos\ tau= vBL\ cos\ tau} where the angle τ is between the length vector( L) of the tether and the electric field vector( E), assumed to be in the vertical direction at right angles to the velocity vector( v) in plane and the magnetic field vector( B) is out of the plane.
In the three-dimensional case the reduced zone scheme means that from any wavevector k{\displaystyle\mathbf{k}} there is an appropriate number of reciprocal lattice vectors K{\displaystyle\mathbf{K}} subtracted that the new k{\displaystyle\mathbf{k}} now is closer to the origin in k{\displaystyle\mathbf{k}}-space than to any K{\displaystyle\mathbf{K.
Written in the non-relativistic limit, it gives E damping( x j, t)e 6 π c 3 d 3 d t 3 x.{\ displaystyle E^{\ text{ damping}}(\ mathbf{ x}_{ j}, t)={\ frac{ e}{ 6\pi c^{ 3}}}{\ frac{\ mathrm{ d}^{ 3}}{\ mathrm{ d} t^{ 3}}} x.} Since the third derivative with respect to the time( also called the" jerk" or" jolt") enters in the equation of motion, to derive a solution one needs not only the initial position and velocity of the particle, but also its initial acceleration.
First, the forward vector may be extended with a zero to obtain:T n.{\ displaystyle\ mathbf{ T}^{ n}{\ begin{ bmatrix}{\ vec{ f}}^{ n-1} \\0\\\end{ bmatrix}}={\ begin{ bmatrix}\&\&\& t_{ -n+1}\\\&\ mathbf{ T}^{ n-1}&\& t_{ -n+2}\\\&\&\&\ vdots\\ t_{ n-1}& t_{ n-2}&\ dots& t_{ 0}\\\ end{ bmatrix}}{\ begin{ bmatrix}\\\{\ vec{ f}}^{ n-1}\\\ \\0\\\\\\ end{ bmatrix}}={\ begin{ bmatrix} 1\\0\\\vdots \\0\\\epsilon_{ f}^{ n}\ end{ bmatrix}}.} In going from Tn-1 to Tn, the extra column added to the matrix does not perturb the solution when a zero is used to extend the forward vector.
Using the linearity of matrices, the following identity holds for all( α, β){\ displaystyle(\ alpha,\ beta)}: T( α+ β)α+ β.{\ displaystyle\ mathbf{ T}\ left(\ alpha{\ begin{ bmatrix}{\ vec{ f}}\\\ \\0\\\end{ bmatrix}}+\ beta{\ begin{ bmatrix} 0\\\\\{\ vec{ b}}\ end{ bmatrix}}\ right)=\ alpha{\ begin{ bmatrix} 1\\0\\\vdots \\0\\\epsilon_{ f}\\\ end{ bmatrix}}+\ beta{\ begin{ bmatrix}\ epsilon_{ b} \\0\\\vdots \\0\\1\end{ bmatrix}}.} If α and β are chosen so that the right hand side yields ê1 or ên, then the quantity in the parentheses will fulfill the definition of the nth forward or backward vector, respectively.