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The object of thought is deductive reasoning (simple proofs), which the student learns to combine to form a system of formal proofs (Euclidean geometry). Learners can construct geometric proofs at a secondary school level and understand their meaning. They understand the role of undefined terms, definitions, axioms and theorems in
One example is the parallel postulate, which is neither provable nor refutable from the remaining axioms of Euclidean geometry. Mathematicians have shown there are many statements that are neither provable nor disprovable in Zermelo–Fraenkel set theory with the axiom of choice (ZFC), the standard system of set theory in mathematics (assuming ...
Thales was known for introducing the theoretical and practical use of geometry to Greece, and has been described as the first person in the Western world to apply deductive reasoning to geometry, making him the West's "first mathematician."
Often the formal system will be the basis for or even identified with a larger theory or field (e.g. Euclidean geometry) consistent with the usage in modern mathematics such as model theory. [clarification needed] An example of a deductive system would be the rules of inference and axioms regarding equality used in first order logic.
For example, in every logical system capable of expressing the Peano axioms, the Gödel sentence holds for the natural numbers but cannot be proved. Here a logical system is said to be effectively given if it is possible to decide, given any formula in the language of the system, whether the formula is an axiom, and one which can express the ...
Download as PDF; Printable version; In other projects ... He is credited with the first use of deductive reasoning applied to geometry, ... is a question in algebraic ...