General theory of $\nabla$-models

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1. P. VOPĚNKA, The limits of sheaves and applications on constructions of models, Bull. Acad. Polon. Sci., sér. mat., astr. et phys., XIII (1965), 189-192. (1965) MR0182570
2. P. VOPĚNKA, On $\nabla$-model of set theory, ibid., 267-272. MR0182571
3. P. VOPĚNKA, Properties of $\nabla$ -model, ibid., 441-444. MR0189984
4. P. VOPĚNKA, $\nabla$ -models in which the generalized continuum hypothesis does not hold, ibid., XIV (1966), 95-99. (1966) MR0200142
5. P. VOPĚNKA, P. HÁJEK, Permutation submodels of the model $\nabla$, ibid., XIII (1965), 611-614. (1965) MR0194320
6. P. HÁJEK, P. VOPĚNKA, Some permutation submodels of the model $\nabla$, ibid., XIV (1966), 1-7. (1966) MR0194321
7. P. VOPĚNKA, Limits of sheaves over compact Hausdorff extremally disconnected spaces, ibid. (in press). 
8. P. VOPĚNKA, P. HÁJEK, Concerning the $\nabla$ -models of set theory, ibid. (in press). 
9. P. VOPĚNKA, Modeli teorii množestv, (in Russian), Zeitschrift f. Math. Logik und Grundlagen der Math. 8 (1962), 281-292. (1962) MR0146085
10. P. HÁJEK, Die durch die schwach inneren Relationen gegebenen Modelle der Mengenlehre, ibid., 10 (1964), 151-157. (1964) MR0164888

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