Prejudicial Logic

Logic that is shaped by prejudice from the start—reasoning that begins with biased assumptions and uses logical form to give those assumptions the appearance of validity. Prejudicial Logic isn't illogical; it's logical within its biased frame. The problem isn't the reasoning—it's the premises, which already contain the prejudice. The logic then functions to make the prejudice seem reasoned, to give bias the cover of rationality.

"They constructed a perfectly valid syllogism: all members of group X are lazy; this person is from group X; therefore this person is lazy. That's Prejudicial Logic—logical in form, prejudicial in content. The logic isn't the problem; the premise is. But the logical form makes the prejudice look like reason."

by Dumu The Void February 28, 2026

Fallacy of Impossible Logic

A rhetorical fallacy where someone demands that an argument follow logical standards that are impossible to meet given the nature of the claim or the context of the debate. The fallacy lies in applying deductive standards to inductive arguments, formal logic to informal reasoning, or mathematical proof to historical interpretation. The demand for "perfect logic" becomes a way of dismissing any reasoning that doesn't fit a narrow, context-inappropriate logical framework.

"Your historical analysis isn't logically valid—it doesn't follow deductive rules." That's Fallacy of Impossible Logic—applying deductive standards to historical reasoning. History doesn't do deduction; it does inference to best explanation. Demanding deductive validity from historical argument is like demanding a fish to climb. Logic is multiple; your logic isn't the only logic."

by Dumu The Void February 28, 2026

Logical Biases

Systematic distortions in reasoning that arise not from breaking logical rules but from the way logical systems themselves are constructed, selected, and applied. Unlike cognitive biases (which are psychological), Logical Biases are built into the logic we use—the assumptions that certain logical forms are universally valid, that classical logic is the only logic, that formal validity guarantees truth. Logical Biases include: preferring deductive over inductive reasoning even when deduction isn't appropriate; treating logical consistency as the highest virtue when life requires contradiction; assuming that what's logically possible is actually possible. Logical Biases are what happen when logic becomes ideology—when the tool becomes the master.

Logical Biases "He keeps demanding that my ethical argument be deductively valid. That's Logical Bias—applying deductive standards to ethics, which isn't deductive. His logic biases him against forms of reasoning that don't fit his logical framework. Logic should serve inquiry, not constrain it. When logic becomes a bias, it stops being logic."

by Dumu The Void March 1, 2026

Logic Biases

A variant of Logical Biases, emphasizing biases that affect how we use and evaluate logic itself. Logic Biases include: treating logic as neutral when it's culturally specific; assuming that logical skill equals intelligence; privileging logical argument over other forms of knowing; using logic as a weapon rather than a tool. Logic Biases are meta-biases—biases about logic, not just in logic. They shape who gets heard, what counts as reasonable, and which conclusions are considered valid.

Logic Biases "He thinks he's won every argument because he's 'more logical.' That's Logic Bias—treating his particular logical style as universal reason. But his logic is one logic among many, and his bias makes him blind to other ways of reasoning. Logic isn't a contest; it's a conversation. Logic biases turn conversation into combat."

by Dumu The Void March 1, 2026

Logical Metametabiases

The most meta level of bias: biases about biases about logic—systematic distortions in how we think about our thinking about logical systems. Logical MetaMetabiases occur when we develop theories about logical biases that are themselves biased, creating infinite regress of reflection. They include: assuming we can fully escape logical bias; treating awareness of bias as immunity to it; using meta-analysis as a way to feel superior rather than to understand; creating hierarchies of bias-awareness that become new biases. Logical MetaMetabiases are what happen when reflexivity becomes its own form of blindness—when knowing about bias becomes a way of not seeing your own.

Logical Metametabiases "He's read all the books on logical biases, so now he thinks he's immune. That's Logical Metametabias—using knowledge of bias as a shield against self-examination. Knowing about bias doesn't eliminate it; it just gives you new ways to be biased about bias. The meta-level isn't escape; it's just another level. Thinking you've transcended bias is the ultimate bias."

by Dumu The Void March 1, 2026

Logic Metabiases

Second-order biases about logic itself—biases in how we evaluate, teach, and apply logical systems. Logic Metabiases include: treating classical logic as the baseline and others as deviations; assuming logical skill is innate rather than learned; using logic to police rather than to understand; believing that more logic always leads to better thinking; assuming logical people are less biased. Logic Metabiases are biases about logic's role, value, and nature—not biases in logical reasoning, but biases in how we relate to logic as a practice.

Logic Metabiases "He thinks studying logic makes him objective. That's Logic Metabias—confusing logical training with freedom from bias. Logic is a tool; using it doesn't make you unbiased—it just gives you a particular kind of training. The metabias is thinking logic is above bias, when it's actually one of the places bias hides best."

by Dumu The Void March 1, 2026

Theory of Constructed Logic

The proposition that logic itself is a human construction—not a discovery about the universe but a tool we've built for specific purposes. Different cultures, different eras, different domains have developed different logics. Classical logic, fuzzy logic, paraconsistent logic, indigenous logics—these are constructions, not revelations. The Theory of Constructed Logic doesn't claim logic is arbitrary; it claims logic is made, not found, and understanding how it's made is essential to using it well. Logic is a tool, not a truth—a tool that shapes what we can think and say.

Theory of Constructed Logic "You think logic is universal, discovered, not made. Theory of Constructed Logic says: look at history—different logics for different purposes. Classical logic for mathematics; fuzzy logic for vagueness; paraconsistent logic for contradictions. Logic is constructed, like language, like law. That doesn't make it less useful—it makes it ours, responsible to our needs, not to some imagined logical heaven."

by Dumu The Void March 1, 2026