Münchhausen Trilemma

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Cogito ergo sum Logic and rhetoric

Key articles

Logical fallacy Syllogism Argument

General logic

Two wrongs make a right Argument from incredulity Substituting explanation for premise Leading question Argumentum ad cellarium Apelo à fé

Bad logic

Due diligence Fallacy of accent PIDOOMA Envenenar o poço Affirming the consequent گزاره‌ی حمله‌ی شخصی v - t - e

The Münchhausen Trilemma is a problem in philosophy that all statements can be questioned and then need evidence. This problem has been well known in philosophy for thousands of years, but rarely gets addressed because it breaks the legs of philosophy, science, and any other possible approach to reality. In short, the trilemma asserts that in order to prove something, one must rely on one of the following: infinite regress, self-evidence, or circular reasoning.

Who was Münchhausen?

"Karl Friedrich Hieronymus, Freiherr von Münchhausen" was a German nobleman with a reputation for storytelling. Somewhat to his annoyance, he inspired a fictional collection of tall tales, by various authors, supposedly told by one Baron Munchausen. In one of those anecdotes, he claims to have pulled himself, and the horse he was sitting on, out of a swamp by his own hair.

The problem

Some people would say that all statements need evidence to support them. Others would say that some statements can follow out of other statements. Most people belong to both categories, but all face one problem: what if there's no evidence for a fundamental statement and that statement also doesn't follow out of any other statements? Well as far as we know there are, in principle, three options:

1. Circular reasoning: X is because of Y, Y is because of X. We arrive at a state where statements make each other true. This has the inherent problem that a logical fallacy would serve as the basis of otherwise logically sound theories, which isn't all that bad but gives most people a stomach ache.
2. Argumentum ad infinitum: The reasoning for a single statement regresses endlessly. While being the scientifically most sound option, this puts a bit of a damper on all discussions as humans tend to die, or at least circle back to an already-given reason because they have hit a wall and do not want to hold the last reason to be self-evident, at some point and occasionally need sleep.
3. Self-evident argument: The argument is so clearly true that no supporting evidence is needed. This is practiced most of the time, but sometimes gets out of hand or one ends up insulting somebody's intelligence or arguing that most people know this to be true, therefore it is true. There is also the problem of "common sense".

But these are only the abstract and metaphysical options for solving the problem of the fundamental statement that also doesn't follow out of any other statements, Aenesidemus originally gave these 10 more concerte options for solving the same problem, which Agrippa the Skeptic summarized in his tropes of Dissent and Relation:

• Different animals manifest different modes of perception;
  • Similar differences are seen among individual men;
  • For the same man, information perceived with the senses is self-contradictory and varies from time to time with physical changes, including those in local relations
• Objects in a condition of perpetual change in colour, temperature, size and motion are known only indirectly through the medium of air, moisture, etc.
• All perceptions are relative and interact one upon another
• Our impressions become less critical through repetition and custom
• All men are brought up with different beliefs, under different laws and social conditions

There's also a less known fourteenth option:

• Run!

So how's that?

On multiple occasions in history, it has been asked how we can know for certain what is true and what is not. For example, it is possible that rather than being many billions of years old as the scientific evidence strongly suggests, the Universe was actually made last Thursday. It is also possible that the entire world is the creation of your own mind, like a dream it takes you several decades to wake up from.

Attempts to attach any objective importance to speculations on this topic may alternatively be called bullshit.

See also

• Solipsism - the belief that the self is the only certainty
• Presuppositionalism - a type of apologetics that exploits the trilemma