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The chaotic, real-world factors that corrupt pure logical reasoning when it leaves the textbook and enters human brains. These are the cognitive biases, emotional states, social pressures, and physical limitations that ensure no actual human being ever reasons with perfect formal logic. You might know that A implies B, but if B triggers your childhood trauma, your brain will find seventeen creative ways to deny the implication. External Variables are why logic puzzles are easy and real arguments are impossible—because real arguments involve sleep deprivation, ego, and that thing your dad said in 1998.
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