#vector #vectorcalculus #gradient #divergence #curl #tensoranalysis #bsmath #mscmath<br />4.1 Introduction<br />4.2 scalar and vector fields<br /><a href="https://youtu.be/pFDkZ6CH-eY" target="_blank" rel="nofollow">https://youtu.be/pFDkZ6CH-eY</a><br />4.3 level surfaces<br /><a href="https://youtu.be/Va15gDxpwMA" target="_blank" rel="nofollow">https://youtu.be/Va15gDxpwMA</a><br />...<br /><a href="https://www.youtube.com/watch?v=Va15gDxpwMA" target="_blank" rel="nofollow">https://www.youtube.com/watch?v=Va15gDxpwMA</a>