How Did Paul Dirac's E=mc² Lead to the Discovery of Antimatter?

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Hi I am curios about something we know E2=(mc2)2+(pc)2 than Paul Dirac maid E2=(mc2)2 than we know he find antimatter
I want to said there's a chance to E=-pc because its logical you can say photon and antiphoton is same but I think there's no reason to say this is false.
 
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I didnt understand what you don't understand
 
I'm sorry, you're going to need to make a little more effort to use correct grammar if you want your question to be understood. If english isn't your natural language, I recommend asking someone for help if you can.
 

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