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References to 'opposite number'
1. associates by drini
2. complex by drini
3. coordinates of midpoint by pahio
4. empty sum by pahio
5. example of telescoping sum by pahio
6. factors with minus sign by pahio
7. Gauss--Lucas theorem by pahio
8. high school mathematics by matte
9. positive by pahio
10. product of negative numbers by pahio
11. topics on calculus by alozano
12. trigonometric equations by pahio