Geodesic
Baire functions and spaces of Baire functions
Fundamentalʹnaâ i prikladnaâ matematika, Tome 9 (2003) no. 4, pp. 3-39.

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The paper considers (1) the tightness of spaces of Baire functions and their subspaces endowed with the topology of pointwise convergence; (2) $Z_{\sigma}$-mappings of $K$-analytic spaces; (3) $K_{\sigma}$-analytic spaces (Tychonoff spaces which are $Z_{\sigma}$-images of $K$-analytic spaces). 
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E. G. Pytkeev. Baire functions and spaces of Baire functions. Fundamentalʹnaâ i prikladnaâ matematika, Tome 9 (2003) no. 4, pp. 3-39. http://geodesic.mathdoc.fr/item/FPM_2003_9_4_a0/

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