###How to launch multiple robots in gazebo simulator and how to setup navigation stacks for such a simulation?###
There were already some questions and answers for the subject, like: [here](answers.ros.org/question/41073/multiple-turtlebots-in-gazebo), and [here](http://answers.ros.org/question/37582/multi-robot-simulation-in-ros), and [here](http://answers.ros.org/question/40397/multirobot-laser-rviz). This is my question and answer to summarize the discussion in one place.
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