For me, "K" and "a K" seem interchangeable in those phrases. ) Not really, at least not in the sense that "one" can naturally be substituted.
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Stenka25In this case a means one.(Am I right?)Not really, at least not in the sense that "one" can naturally be substituted.
Stenka25a question regarding 'K' vs. 'a K'."K" is, you might say, the proper noun form. "K" is the name of that symbol. "K" is the symbol named "K".