ehm, sorry, i am a beginner in set theory. learning on my own.(adsbygoogle = window.adsbygoogle || []).push({});

for cartesian product ordered pair, for example

[itex] A = \{a_1, a_{2}, a_{3}\} \\

B = \{b_{1}, b_{2}, b_{3}\} [/itex]

is the product [itex] A \times B = \{a_{1}b{1}, a_{1}b{2}, a_{1}b{3}, a_{2}b{1}, \\

a_{2}b{2}, a_{2}b{3}, a_{3}b{1}, a_{3}b{2}, a_{3}b{3},\} [/itex] ??

What does [itex] A \times B = \{(a,b)\mid a \in A and b \in B\} [/itex] mean in detail?

thanks.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Simple question, please help

**Physics Forums | Science Articles, Homework Help, Discussion**