can the pope change doctrine?

With all the media attention on Pope Francis, I have read many things about his ability to change doctrine. Can anyone, even the Pope, change doctrine? Or is discipline the only thing that evolves and changes? Thank you for the clarification among so much misinformation.

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*]Is It a Doctrine or a Discipline?
*]Can Dogma Develop?
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*]Can the Church change its doctrines?

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