1.   But political arrangements can not correspond to some tidy mathematical formula.

2.   Census takers then turn the difference into a mathematical formula and apply it to the city as a whole.

3.   Census takers then turn the difference into a mathematical formula and apply it to the overall locality.

4.   It is unfortunate that the authors avoid mathematical formulae which are essential for a proper understanding of the experiments.

5.   We feed the figures into a mathematical formula and the formula then takes over and does the processing for us.

6.   He developed a mathematical formula describing the distances of the planets from the Sun.

7.   These assumptions and the mathematical formula used to calculate the volume have been described and validated by Everson and colleagues.