Hi.<br/><br/>Do we have to use <u><i><b>s</b></i></u> (third person singular) for a verb which follows one?<br/><br/><i>Ex. From the following equation, one obtains/obtain . . . . . .</i><br/><br/>Is <i>one</i> considered a third person singular here? Which part of speech is one? Is it pronoun?<br/><br/>Thanks for your time and help