Such heart rate at rest indicates cardiac efficiency of an individual, and ranges between 60 to 100 bpm (beats per minute) for adults. However, values closer to the lower limit of this range qualify as a good resting heart rate. In fact, well trained athletes show a resting heart rate between 40 to 60 bpm.
Rule 1. With a computer, use only one space following periods, commas, semicolons, colons, exclamation points, question marks, and quotation marks. The space needed after these punctuation marks is proportioned automatically.
In the second one, the neighborhood is replaced by the open interval, and the neighborhood by the open interval. For a function of variables, the absolute value would be replaced by the norm of, and the open intervals by the open balls and respectively. This does not affect the meaning of the statement, since every neighborhood of a given point contains an open ball centered at that point.