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"Mirror Image" is a short story by Isaac Asimov, first published in 1972 in Analog Science Fiction/Science Fact . It features Asimov’s two most famous recurring characters: robot psychologist Dr. Susan Calvin and mathematician (later Galactic Empire politician) Dr. Elia Baley. The story is a classic example of Asimov’s “logical puzzle” approach to science fiction, focusing not on action or emotion but on the application of deductive reasoning to a seemingly intractable contradiction.

Two mathematicians, Gennao Sabbat and Milton Ashe, both highly respected, each claim that the other asked them for help with a robotic computation problem aboard a spaceship. The catch: the incident happened in a private corridor, with no human witnesses. However, there was one witness: a small utility robot named RB-34 (“Herbie”), which has limited communication ability. When interrogated, Herbie confirms both men’s accounts. This is impossible—unless one of them is lying.

, between the original robot novels and their later sequels. Plot Overview

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The story is set aboard a Spacer ship where two eminent mathematicians, Alfred Barr Humboldt and Gennao Sabbat, accuse each other of plagiarizing a revolutionary mathematical technique. The Conflict:

Elijah Baley is consulted not to solve a crime, but to determine which man is lying. He realizes that a robot might hold the key. Each scientist has a personal robot servant. Baley interviews the robots, but hits a wall: the robots are bound by the First Law ("A robot may not injure a human being..."). Telling the truth about their master’s guilt would harm their master’s reputation and career, which the robots interpret as "injury." Therefore, the robots remain silent or insist on their master's innocence to prevent that harm.

Both mathematicians tell nearly identical stories, simply swapping their roles as the original discoverer and the victim of theft.

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: It provides essential character development for R. Daneel Olivaw's journey toward human-like intuition.

is a name synonymous with science fiction. His legendary Robot series, which introduced the world to the Three Laws of Robotics , has shaped our modern understanding of artificial intelligence. Among his most intellectually stimulating tales is a lesser-known gem: Mirror Image .