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position than the IJKL keys (see above), and the number pad has fewer keys around it, thus it is less likely the player will hit the wrong key by mistake. Another...

launch title for the IBM PCjr, announced in late 1983. The player uses the IJKL keys to move or the joystick (the Atari and Commodore versions are joystick...

W\approx {\frac {1}{2!}}C_{ijkl}E_{ij}E_{kl}+{\frac {1}{3!}}C_{ijklmn}E_{ij}E_{kl}E_{mn}+\cdots ,} where C i j k l {\displaystyle C_{ijkl}} is a fourth-order...

l ε k l , {\displaystyle \sigma _{ij}=C_{ijkl}\varepsilon _{kl},} where the C i j k l {\displaystyle C_{ijkl}} are the components of the 4th-rank elastic...

component of the displacement vector U, and c i j k l {\displaystyle c_{ijkl}} represents the elastic tensor. A wavefront can be described by the equation...

permutation of  ( 1 , 2 , 3 , 4 ) 0 otherwise {\displaystyle \varepsilon _{ijkl}={\begin{cases}+1&{\text{if }}(i,j,k,l){\text{ is an even permutation of...

e^{k},} R i j k l = ( R ( e i ∧ e j ) ⋅ e k ) ⋅ e l . {\displaystyle R_{ijkl}=({\mathsf {R}}(e_{i}\wedge e_{j})\cdot e_{k})\cdot e_{l}.} These relations...

to the strain by σ i j = C i j k l ε k l , {\displaystyle \sigma _{ij}=C_{ijkl}\varepsilon _{kl},} where we are now using Einstein notation for the tensors...

C i j k l e k l i , j , k , l = 1 , 2 , 3 {\displaystyle \sigma _{ij}=C_{ijkl}e_{kl}\quad i,j,k,l=1,2,3} where σ is the stress, C is the elastic moduli...

_{ij}=\sigma _{ji}} ). σ i j = C i j k l ε k l {\displaystyle \sigma _{ij}=C_{ijkl}\varepsilon _{kl}} The quality of the produced data can be assessed by taking...