| 11. | Haskell Curry defined mathematics simply as " the science of formal systems ".
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| 12. | :In studying formal logic you use mathematics to describe formal systems.
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| 13. | A formal system is used to model ) of external phenomena.
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| 14. | Mathematics in the twentieth century evolved into a network of axiomatic formal systems.
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| 15. | A formal system of equalization payments was first introduced in 1957.
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| 16. | A formal system of licensing, laws and administrative rules was enacted.
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| 17. | The purpose of Stoic syllogistic was not merely to create a formal system.
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| 18. | It established a formal system of tobacco inspection and quality control.
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| 19. | "There doesn't seem to be a formal system to gather all these things together.
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| 20. | Educated Saudis would prefer a more formal system of government.
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