In this section we are going to introduce the concepts of the curl and the divergence of a vector.
Sadly, accidents on highways involving buses and heavy trucks are not uncommon.
Whereas the editors of al-Imam had tried to inculcate in the peoples of Southeast Asia some regard for the Ottoman Sultan as the khalifa of Islam, primarily by presenting him as the enlightened ruler of a modern-day power, it was not until the 1920s, when Atatürk was on the verge of scrapping the whole idea, that people in Southeast Asia became concerned about their caliph see van Bruinessen 1995.