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@ -244,7 +244,7 @@ $`dx`$, $`dy`$ y $`dz`$, et il s'écrit :<br> |
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in cartesian coordinates is the displacement vector from point $`M(x,y,z)`$ to point |
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in cartesian coordinates is the displacement vector from point $`M(x,y,z)`$ to point |
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$`M'(x+dx,y+dy,z+dz)`$ when the coordinates vary infinitely in quantities $`dx`$, $`dy`$ y $`dz`$, |
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$`M'(x+dx,y+dy,z+dz)`$ when the coordinates vary infinitely in quantities $`dx`$, $`dy`$ y $`dz`$, |
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and it writes :<br> |
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and it writes :<br> |
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<br>$`=\overrightarrow{MM'}=d\overrightarrow{OM}=\overrightarrow{dr}=\overrightarrow{dl}`$ |
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<br>$`\overrightarrow{MM'}=d\overrightarrow{OM}=\overrightarrow{dr}=\overrightarrow{dl}`$ |
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$`=\partial\overrightarrow{OM}_x+\partial\overrightarrow{OM}_y+\partial\overrightarrow{OM}_z`$ |
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$`=\partial\overrightarrow{OM}_x+\partial\overrightarrow{OM}_y+\partial\overrightarrow{OM}_z`$ |
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$`=\overrightarrow{dl_x}+\overrightarrow{dl_y}+\overrightarrow{dl_z}`$ |
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$`=\overrightarrow{dl_x}+\overrightarrow{dl_y}+\overrightarrow{dl_z}`$ |
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$`=l_x\;\overrightarrow{e_x}+l_y\;\overrightarrow{e_y}+l_z\;\overrightarrow{e_z}`$ |
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$`=l_x\;\overrightarrow{e_x}+l_y\;\overrightarrow{e_y}+l_z\;\overrightarrow{e_z}`$ |
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