0 0 m -1 0.333 l -1 -0.333 l h 0 0 m -1 0.333 l -1 -0.333 l h 0.6 0 0 0.6 0 0 e 0.4 0 0 0.4 0 0 e 0.6 0 0 0.6 0 0 e 0.6 0 0 0.6 0 0 e 0.4 0 0 0.4 0 0 e 0.4 0 0 0.4 0 0 e -0.6 -0.6 m 0.6 -0.6 l 0.6 0.6 l -0.6 0.6 l h -0.4 -0.4 m 0.4 -0.4 l 0.4 0.4 l -0.4 0.4 l h -0.6 -0.6 m 0.6 -0.6 l 0.6 0.6 l -0.6 0.6 l h -0.6 -0.6 m 0.6 -0.6 l 0.6 0.6 l -0.6 0.6 l h -0.4 -0.4 m 0.4 -0.4 l 0.4 0.4 l -0.4 0.4 l h -0.4 -0.4 m 0.4 -0.4 l 0.4 0.4 l -0.4 0.4 l h -0.43 -0.57 m 0.57 0.43 l 0.43 0.57 l -0.57 -0.43 l h -0.43 0.57 m 0.57 -0.43 l 0.43 -0.57 l -0.57 0.43 l h 0 0 m -1 0.333 l -1 -0.333 l h 0 0 m -1 0.333 l -0.8 0 l -1 -0.333 l h 0 0 m -1 0.333 l -0.8 0 l -1 -0.333 l h -1 0.333 m 0 0 l -1 -0.333 l 0 0 m -1 0.333 l -1 -0.333 l h -1 0 m -2 0.333 l -2 -0.333 l h 0 0 m -1 0.333 l -1 -0.333 l h -1 0 m -2 0.333 l -2 -0.333 l h $_w\mathtt{p}$ $\overrightarrow{\mathcal{F}}_w$ 64 576 m 96 576 l 64 576 m 64 608 l 64 576 m 80 592 l 144 688 m 176 688 l 144 688 m 144 720 l 144 688 m 160 704 l 285.262 759.615 m 162.017 735.456 129.232 628.801 s $\mathtt{T}_{f,w}$ 128.441 626.745 m 320.625 647.224 l 331.681 587.399 m 331.681 587.399 l $x$ $z$ $y$ 256 736 m 224 704 l 320 704 l 352 736 l h 285.262 759.265 m 322.176 651.119 l $\mathtt{px}$ 285.612 758.915 m 315.723 669.632 l $\mathtt{f}$ $\overrightarrow{\mathcal{F}}_f$ 255.668 719.918 m 274.728 719.957 l 256.107 720.028 m 246.655 710.527 l $v$ $u$ $\mathbf{p}$ $_f\mathtt{p}$