Rules do change over time. A long-dead grammarian declared that one should not split infinitives. Many modern grammarians feel that splitting infinitives is acceptable. If you do split infinitives, do so deliberately and with the understanding that some of your readers may wince. Similarly, many high school teachers hold fast to the arbitrary rule of not ending a sentence with a preposition.
Modern authorities feel that terminal prepositions are allowable in moderation.
The Math 696 course pages were last modified September 19, 2001. All rights reserved.