# Math Help - Unknown math problem.

1. ## Unknown math problem.

Hy. It would sound stupid, but I am trying out to figure what this is, because i was missing in on some lectures and i dont have any good translation for this and now i am completely in dark.
$(a, b) = \{\{a\}, \{a, b\}\}$
$(a, b) = (c, d) \Longleftrightarrow a = c \wedge b = d$

2. Originally Posted by PJani
Hy. It would sound stupid, but I am trying out to figure what this is, because i was missing in on some lectures and i dont have any good translation for this and now i am completely in dark.
$(a, b) = \{\{a\}, \{a, b\}\}$
$(a, b) = (c, d) \Longleftrightarrow a = c \wedge b = d$