"Roped together like two mountain-climbers," as one said, what two artists invented the analytic and synthetic methods of cubist painting?

Question

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The analytic and synthetic methods of cubist painting were invented by Georges Braque and Pablo Picasso, who worked closely together during the early years of Cubism. They developed the analytic method in which an object is analyzed and broken down into its basic parts, then depicted from multiple viewpoints. The synthetic method involved the construction of a complex image from fragments of visual information.

"Roped Together Like Two Mountain-Climbers," as One Said, What Two