<spanstyle="font-size:1rem;text-align:left;color:#6699ff">entre ces deux points.</span></p>
##### <p style="font-family:'Times New Roman';font-size:1.1rem;text-align:left;color:#009933">Tous les observateurs partagent<br>
##### <p style="font-family:'Times New Roman';font-size:1.1rem;text-align:left;color:#cccccc">un <span style="color:#0033cc">invariant spatial</span><br><span style="font-size:0.7rem;text-align:left;color:#6699ff">entre deux points A et B</span><br><span style="font-size:0.7rem;text-align:right;color:#6699ff">de l'espace 3D euclidien classique</span><br><span style="font-size:1.1rem;text-align:left;color:#cccccc">appelé</span><span style="font-size:1.45rem;left;color:#cc3300">longueur l<sub>AB</sub></span><br><span style="font-size:0.7rem;text-align:left;color:#6699ff">entre ces deux points.</span></p>
##### <p style="font-family:'Times New Roman';font-weight:bold;font-size:1.1rem;text-align:left;color:#009933">Tous les observateurs partagent<br>
##### <p style="font-family:'Times New Roman';font-weight:bold;font-size:1.1rem;text-align:left;color:#cccccc">un <span style="color:#0033cc">invariant spatial</span><br><span style="font-size:0.95rem;text-align:left;color:#6699ff">entre deux points A et B</span><br><span style="font-size:0.95rem;text-align:right;color:#6699ff">de l'espace 3D euclidien classique</span><br><span style="font-size:1.1rem;text-align:left;color:#cccccc">appelé</span><span style="font-size:1.1rem;left;color:#cc3300">longueur l<sub>AB</sub></span><br><span style="font-size:0.95rem;text-align:left;color:#6699ff">entre ces deux points.</span></p>