Write the following compound statements in symbolic form, then use your knowledge of the historical events referred to by the simple statements to determine the truth value of the compound statements....

Write the following compound statements in symbolic form, then use your knowledge of the historical events referred to by the simple statements to determine the truth value of the compound statements.

Lincoln’s having written the Gettysburg Address is a sufficient condition for Alexander the Great’s having civilized America if and only if Washington’s being assassinated is a necessary condition for Custer’s having been killed by the Indians.