Update textbook.fr.md

12.temporary_ins/44.relativity/40.n4/10.special-relativity/07.coherence/textbook.fr.md

@@ -39,8 +39,8 @@ ds^2&=c^2 dt^2- dx^2- dy^2- dz^2\\
 $`x^0=ct\;;\;x^1=x\;;\;x^2=y\;;\;x^3=z`$
 
 $`\begin{align}
-ds^2 &=(dx^0{'})^2 -(dx^1)^2 -(dx^2)^2 -(dx^3)^2\\
-&=(dx^0)^2 -(dx^1)^2 -(dx^2)^2 -(dx^3)^2\\
+ds^2 &=(dx^0)^2 -(dx^1)^2 -(dx^2)^2 -(dx^3)^2\\
+&=(dx^0{'})^2 -(dx^1{'})^2 -(dx^2{'})^2 -(dx^3{'})^2\\
 \end{align}`$
 
 $`\begin{align}
@@ -49,7 +49,7 @@ ds^2 &=\big(dx^{0} \big)^2 -\big(dx^1\big)^2 -\big(dx^2\big)^2 -\big(dx^3\big)^2
 &=g_{ab}\;dx^a dx^b
 \end{align}`$
 
-tensuer métrique associé aux coordonnées $`\big(x^0,\,x^1,\,x^2,\,x^3\big)`$                                           
+tenseur métrique associé aux coordonnées $`\big(x^0,\,x^1,\,x^2,\,x^3\big)`$                                           
 
 $`g_{ab}`$
 $`\;=\begin{pmatrix}