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Concerning formulas of the types A $$\rightarrow$$ B $$\vee$$ C, A $$\rightarrow$$ (E x) B (x) in intuitionistic formal systems. (English) Zbl 0098.24201

##### Keywords:
philosophy and foundation of mathematics
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##### References:
 [1] this Journal 23 pp 456– (1958) [2] Constructivity in mathematics pp 101– (1958) [3] DOI: 10.1007/BF01360048 · Zbl 0071.24504 · doi:10.1007/BF01360048 [4] Introduction to metamathematics (1952)
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