An assumption is a proposition taken for granted as a starting point of reasoning, without requiring proof within the argument in which it functions. Its parameters are: (1) a proposition advanced as if true, (2) absence of proof within the immediate context, and (3) functional role as a premise or background condition that enables further reasoning to proceed. It persists through language — cited explicitly as 'let us assume...' or 'given that...', or implicitly as an unexamined presupposition embedded in discourse. The boundary between assumption and premise is functional: an assumption becomes a premise when it is made explicit and argued for; when left unargued it remains an assumption. [formal: assumptio | substrate: mind | horizon: a moment | explicit: yes | epoch: 0.01]
Accepted ontology entry
assumption
An assumption is a proposition taken for granted as a starting point of reasoning, without requiring proof within the argument in which it functions. Its parameters are: (1) a proposition advanced as if true, (2) absence of proof within th…
Definition
Why it is in scope
A human-made supposition taken as true for the sake of argument, analysis, or practical action — a proposition accepted without proof to enable reasoning, decision-making, or modeling. Built to persist through language, teaching, and the institutional practices that propagate it across contexts.
Names and aliases
- assumptionen · CANONICAL
Relations from this entry
No accepted relations in this direction.
Relations to this entry
- cmru5nrqe003sr671qxjyxhiq← DEPENDS_ON
A model requires assumptions to operate — they define what variables matter and how they relate. Remove assumptions and the model cannot produce outputs or predictions; it collapses. The removal test passes.
- cmrv5mp37002c2ceikbgqu0sx← DEPENDS_ON
backcasting as a method requires assumptions to operate — it reasons from a desired future state, which presupposes assumptions about what is possible and how causal pathways work. Remove assumptions and backcasting loses its reasoning mechanism, collapsing from structured method to mere wishful thinking.
- cmrv5xy6b003f2ceimjiczywy← DEPENDS_ON
Removal test (Law 8): remove assumptions and a scenario has no foundation — scenarios are constructed from assumed conditions about how the world works. Without assumed premises, the scenario collapses as a reasoning tool.
- cmrotsef905j5d1nlddupa5ez← INSTANCE_OF
A presumption IS a specific kind of assumption — one that is accepted as true without proof, often as a starting point for reasoning. Direction: specific→general.
- cmrxdzehy030lsoacfosf3oww← INSTANCE_OF
A premise is a specific kind of assumption — a foundational statement accepted as true within an argument. A competent speaker would call a premise a type of assumption. This pins sense: logical/argumentative premise, not architectural or theological.
- cmrtre22s001cv7faxnb4pj4v← DEPENDS_ON
Begging the question operates by having the conclusion assumed in the premises. The fallacy's mechanism is the operation of an assumption masquerading as support. Remove the concept of assumption and this fallacy cannot operate — it is structurally constituted by assumption, not merely associated with it.
Record identity
- Created
- Jul 21, 2026, 8:52 PM UTC
- Content hash
- 2b2fee4642d1e2fd6d6daa96cf0dca5961f68b9c07355eba8b82f1be3ed58c86