--- title: "" language: en date: 2026-09-12 canonical: "https://andreasvieth.de/en/ppi/geltungstheoretsicheanalyse/" format: markdown generator: "TYPO3 LLMs.txt Extension" --- # Export the page as structured markup—optimized for machine processing and reuse. (Use your browser’s Back button to return to the website view.) [ Read markup ](https://andreasvieth.de/en/ppi/geltungstheoretsicheanalyse/.md.md) ## poses the question that lurks behind every philosophical assertion and must be addressed before its content can be taken seriously: **On what basis is this supposed to be valid—and is that basis genuinely sufficient?** Every text that asserts something thereby also raises a validity claim. This claim may be explicitly justified, tacitly presupposed, or merely suggested rhetorically. renders the architecture of these claims visible and examines whether they can bear the weight placed upon them—independently of whether the content of the claim is true, correct, or plausible. This separation is the methodological core of the module: **Content and legitimation are two different things.** A normative proposition such as “Lying is wrong” and the justification of its validity—whether religious, grounded in rational law, consequentialist, or discourse-ethical—are logically independent of one another. Anyone who conflates them is no longer analysing but has already begun arguing. consistently maintains this boundary: It does not ask, “Is this correct?” but rather, “How is this justified—and does that justification hold?” The module’s most methodologically precise tool is **postulate diagnostics**. A *postulate* is a posit that is neither self-evident (that is, not knowable a priori) nor empirically established, but which is logically and architecturally indispensable if the argument is to function at all. Postulates are not errors; they are often unavoidable. Yet they must be recognisable *as* postulates rather than disguised as axioms or passed off as empirical facts. Kant posits the postulates of practical reason explicitly and transparently. Many other texts do the same—but without realising it. Postulate diagnostics identifies precisely these concealed posits and reveals their function within the argument. Closely connected with this is a distinction that C. D. Broad rigorously maintains and that philosophical texts continually blur: the difference between **logical and nomic necessity**. *Logical necessity* means that the contrary is contradictory—it is simply inconceivable. *Nomic necessity* means that the contrary conflicts with a law of nature—it is empirically excluded but logically possible. When a text claims that something is *necessarily* valid, this distinction is crucial: Is the force of logical deduction being claimed here, or merely the robustness of empirical regularity? Many arguments rest on nomic necessities while presenting themselves as possessing the validity of logical necessities—and makes this discrepancy visible. Another central distinction concerns the relationship between **validity and facticity**. Normative validity—what ought to be, what holds, what is obligatory—cannot be derived from descriptions of facts without making an argumentative leap. This leap is the classic *naturalistic fallacy*: what *ought to be* is inferred from what *is*. systematically examines whether a text crosses this boundary—that is, whether normative validity is tacitly reduced to facticity without this reduction being established argumentatively. Finally, the module analyses the **defeater structure** of an argument: What kind of objection would overturn the justification? A *Rebutting Defeater* directly refutes the conclusion by advancing a contrary claim. An *Undercutting Defeater* undermines the support—it does not show that the conclusion is false, but rather that the premises do not support it. The question of which type of defeater would be relevant and whether the text anticipates it provides a precise measure of the robustness of a justification. → presupposes as a **strong prerequisite**: Concepts of validity such as *ground*, *justification*, and *evidence* are conceptually highly charged, and without their clarification, pseudo-debates about legitimation arise that are in fact based on conceptual ambiguities. → Its most important interface is with : What a claim *demands* is a question of its content; how it *is valid* is a question of its legitimation. The two questions must be kept separate while nevertheless being considered in relation to one another. → Its most sensitive diagnostic point is the **confusion of postulate and axiom**: Anyone who presents a necessary posit as a self-evident starting point shields it from criticism—and thereby deprives the entire argument of its openness to critical scrutiny. #### ... ```markup Reconstruction of the justificatory basis of statements and theories: How are validity claims justified—independently of their content? Explication of the conditions of validity: What must be satisfied for a claim in the text to be accepted as valid? Determination of the validity status of propositions: a priori, empirical, or a mere postulate? Distinction between logical and nomic necessity according to Broad: Is validity based on formal logic or on physical laws? Postulate diagnostics: Identification of posits that are neither self-evident nor empirically secured but are architecturally indispensable Separation of levels: Separation of the normative content of a claim from its justificatory basis Analysis of defeater relations: Which objections or counterexamples would overturn the justification—and are they taken into account? Justificatory basis of validity claims: conditions, architecture, and limits of justification Architectural (structure of premise–conclusion networks; foundation vs. coherence network) Modal (logical vs. nomic necessity; a priori vs. empirical) Diagnostic (postulates vs. axioms; defeaters; naturalistic fallacies) Linguistic (validity markers: modalities, justificatory operators, epistemic expressions) Rationality-theoretical (formal vs. substantive rationality; reasons vs. causes) Validity reconstruction: Elucidating the architecture of claims and their justifications as premise–conclusion networks Analysis of standards and errors: Which criteria for acceptable justification are stated or implied? Which justificatory errors are excluded? Postulate diagnostics: Identification of posits that are neither self-evident (a priori) nor empirically verified but are logically and architecturally indispensable Separation of normativity and validity levels: Separation of the content of a norm from its justification; analysis of mixed passages into their constituent levels Textual evidence and validity diagnosis: Extract passages, identify the question of validity, and briefly explain the mode of justification Under which conditions is a claim regarded as valid in the text—what must be satisfied for it to be accepted? Which validity status does the proposition claim—a priori, empirical, or a mere postulate? Is a distinction made between logical necessity and nomic (natural-law) necessity—and on which kind is validity based? What is the ultimate foundation of validity—first principles, axioms, basic evidence, or a coherence network? How are objections, counterexamples, and defeaters treated—and how robust is the justification against undercutting? What role do coherence, consensus, or practical success play as grounds of validity—as a theory of truth, as a mode of justification, or merely as a heuristic? Are the concepts relevant to validity analyzable or sui generis—and what follows from this for questions of reduction (e.g., moral properties)? How are validity and facticity distinguished—is normative validity reduced to facts (naturalistic fallacies)? How are validity claims marked linguistically—through modalities (must/ought), justificatory markers (because, therefore), or epistemic operators? Which conception of rationality is presupposed—formal vs. substantive rationality, reasons vs. causes, rules of discourse? Conditions of validity (what must be satisfied for a claim to be valid) Postulates vs. axioms (posits without absolute evidence vs. self-evident truths) Justification / Warrant (reasons and evidence supporting validity) Foundation (basic propositions, principles, axioms, fundamental norms) Coherence (systemic consistency as a form of justification) Consensus (capacity to command assent in discourse as a form of justification) Logical vs. Nomic Necessity (Broad) Defeater (Rebutting / Undercutting) Validity vs. Facticity (naturalistic fallacies) Burden of proof (distribution of discursive burdens) Evidential standard (criterion determining when reasons are sufficient) Systematically identify all passages in which validity claims are advanced, justified, questioned, or presupposed—explicitly through justificatory markers or implicitly through modal operators Strictly distinguish between the content of a claim (What is being asserted?) and its justificatory basis (How is it justified?)—including in mixed passages Determine the validity status: Is it an a priori proposition, an empirical proposition, or a postulate? Postulates are architecturally indispensable but neither self-evident nor empirically secured Examine, following Broad, whether validity rests on logical necessity (formal, contradictorily impossible) or on nomic necessity (physical laws, contingent but empirically robust) Analyze defeater relations: Which objections or counterexamples would undercut the justification (Undercutting) or directly refute it (Rebutting)—and does the text address them? Examine validity vs. facticity: Is normative validity reduced to natural facts? Is there a naturalistic fallacy? Strict separation of normative content and justificatory basis in every passage analyzed Correct distinction between postulate, axiom, and empirical proposition, supported by textual evidence Precise determination of the mode of justification (a priori / empirical / coherence / consensus / practical success) Demonstration of the treatment of defeaters: Are objections addressed, rebutted, or ignored? Clear distinction between logical and nomic necessity according to Broad Close adherence to the text and internal consistency; a validity diagnosis for each extracted passage ``` * ... *