In this paper, we give necessary and sufficient conditions for the space B 1 (X) of first Baire class functions on a Tychonoff space X, with pointwise topology, to be (strongly) sequentially separable. Also we claim that there are spaces X such that B 1 (X) is not sequentially separable space, but C p (X) is sequentially separable (the Sorgenfrey line, the Niemytzki plane).
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