Yes, they are. They all are in Pein.
There are 6 paths of pain. They are all controlled by Nagato. If you include Nagato as one of them then there are 7.
Not really; Pain, or actually the six paths of pain, is a technique that Nagato uses through six bodies.
Yes. He was strong enough to command all six paths of pain. Kakashi was not able to defeat one.
Well, sometimes it all depends on the person. Sometimes the pain will be incredible in one person and it won't be as bad with the other person.
normally the emotional pain person
"The real one isn't there." meaning the real Pain is not seen among the other paths and is hiding.
Pein is really Nagato. But, he appears in Yahiko's body as one of the six paths of pain at most Akatsuki meetings.
He wrote a encrypted message of Pain's secret on fukasaku's back, which was shown to Naruto and Konoha. Edit: Jiraiya wrote "The real one's not among them" referring to the Six Paths of Pain.
Give it to a poor person.
One common algorithm to find all shortest paths between two nodes in a graph is the Floyd-Warshall algorithm. This algorithm calculates the shortest paths between all pairs of nodes in a graph by considering all possible intermediate nodes.
masochist
One who is able or disposed to inflict pain or suffering.