I have some exercise to solve for my automata course at university. I cannot understand, however, what exactly $L_1L_2$ means for some languages $L_1$ and $L_2$. The problem is - prove that If $L_1\cup L_2 \subseteq L_3\cap L_4 => L_1L_2 \subseteq L_3L_4$ . What is $L_1L_2$?
2026-03-27 02:08:29.1774577309
Automata, operation on languages
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Language concatenation is defined as
$$L_1L_2 = \{ uv \mid u \in L_1, v \in L_2 \}$$