Should one capitalize the abbreviation for page at beginning of a sentence?

Yes, you should capitalize the abbreviation "p." when it appears at the beginning of a sentence.

Here's why:

* Abbreviations at the beginning of a sentence are treated like words. They should be capitalized just like any other word that begins a sentence.

* "p." stands for "page" and functions as a noun.

Example:

* P. 12 of the book discusses the history of the topic.

Note: In some cases, you might see "pp." used to refer to multiple pages. In this case, the abbreviation would also be capitalized at the beginning of a sentence.