{"slug":"morankor-math-proof","name":"math-proof","description":"Write clear, detailed mathematical proofs for academic papers. Use when","long_description":"---\nname: math-proof\ndescription: Write clear, detailed mathematical proofs for academic papers. Use when\n  the user asks to prove a result, derive an equation, justify a claim analytically,\n  or expand a proof sketch into a full proof. Also trigger on \"prove\", \"show analytically\",\n  \"derive\", \"justify mathematically\", or \"write a proof\".\nauthor: Moran Koren <korenmor@bgu.ac.il> (Ben-Gurion University of the Negev)\n---\n\n# Math proof\n\n> **Author:** Moran Koren, Ben-Gurion University of the Negev (korenmor@bgu.ac.il). Part of the [Theorist Toolbox](https://github.com/morankor/theorist-toolbox).\n\n\nWrite rigorous mathematical proofs suitable for peer-reviewed academic papers. Every step should be explicit enough that a reader can verify it without filling in gaps. The proof must be a complete proof, not a proof outline — each step should be carefully explained and documented.\n\n## Trigger phrases\n\n- `/math-proof`\n- \"prove this\"\n- \"show analytically\"\n- \"derive this result\"\n- \"justify mathematically\"\n- \"write a proof\"\n- \"expand this proof\"\n\n## Proof strategy\n\nBefore writing a single line of algebra, invest time in planning:\n\n### Choose an approach before committing\n\nConsider at least two proof strategies and state why you chose one:\n- **Direct proof**: Assume hypotheses, derive conclusion step by step.\n- **Proof by contradiction**: Assume the negation; derive a contradiction.\n- **Proof by contrapositive**: Prove $\\neg Q \\Rightarrow \\neg P$ instead of $P \\Rightarrow Q$.\n- **Mathematical induction**: Base case plus inductive step.\n- **Constructive proof**: Exhibit the object whose existence you claim.\n- **Proof by exhaustion**: Enumerate all cases and handle each.\n\n### Attack the hardest step first\n\nIdentify the single most technically demanding step before starting. If you cannot see how to close that step, the entire proof strategy may be wrong. Discovering this before writing three pages of algebra saves significant effort.\n\n### Prove simpler cases as scaffolding\n\nBefore tackling the general claim, prove it for a simple special case ($n=1$, $x=0$, a symmetric configuration, etc.). The special case often reveals the structure of the general proof. Label these explicitly as \"Special case\" or \"Warm-up\" — they are scaffolding, not the proof itself.\n\n### Retrieve before you generate (RAG)\n\nBefore writing any algebra, inventory your tools:\n1. **List all theorems and lemmas** you expect to use, by name.\n2. For each, confirm it is either (a) well-known (Wikipedia page, standard undergraduate course) or (b) something you will prove inline.\n3. Check whether a weaker version of the claim — or a closely related result — is already proved earlier in the paper or in a standard reference. Reuse it rather than reprove it.\n\nDo not attempt the main proof without first knowing which tools are in your kit. Discovering mid-proof that a key lemma is either false or requires its own long proof is the most common cause of a failed proof attempt.\n\n### Sub-agent decomposition\n\nFor complex proofs, treat each major sub-claim as an independent proof task:\n1. **Identify independent sub-claims**: What facts must be true for the main proof to go through? State each as a precise formal claim.\n2. **Prove each sub-claim in isolation**: Each lemma proof stands alone — it should not assume facts from sibling lemmas unless they are explicitly passed in as hypotheses.\n3. **Assemble the main proof last**: The main proof should be short and structural, citing the proved lemmas rather than re-deriving their content.\n4. **Check the assembly**: Verify that the hypotheses of each lemma are actually satisfied at the call site in the main proof.\n\nThis mirrors how AlphaProof handled IMO problems: individual sub-goals are proved and verified independently, then composed into a complete solution. A gap in assembly — using a lemma whose hypotheses are not met — is as fatal as a gap in the lemma itself.\n\n## AlphaProof-inspired pipeline\n\nAlphaProof (DeepMind, 2024) solved IMO problems at silver-medal level using a five-stage loop. Apply the same loop to any proof task:\n\n### Stage 1 — Formalize\n\nTranslate the natural-language claim into a precise formal statement before touching any algebra:\n- Write hypotheses as a bulleted list of mathematical conditions.\n- Write the conclusion as a single mathematical statement.\n- Assign explicit names to all objects, functions, and parameters.\n- Surface all implicit assumptions (e.g., $n \\in \\mathbb{N}$, $f$ continuous, $\\varepsilon > 0$) and write them down.\n\nIf you cannot write a clean formal statement, the claim is ambiguous. Clarify with the user before proceeding.\n\n### Stage 2 — Retrieve\n\nInventory relevant results (see \"Retrieve before you generate\" in Proof Strategy above). Do not enter Stage 3 until your toolkit is assembled.\n\n### Stage 3 — Generate with sub-agent decomposition\n\nDecompose into independent sub-claims and prove each in isolation (see \"Sub-agent decomposition\" above). Consider multiple proof strategies in parallel; abandon any path where the hardest step is not closable.\n\n### Stage 4 — Verify\n\nApply the mechanistic verifiability check to every line (see Core Principles). For maximum rigor, translate the proof into Lean 4 (see \"Lean verification\" below). Only accept a step that survives this check.\n\n### Stage 5 — Iterate\n\nIf verification fails at a step, do not patch around it. Return to Stage 3, understand why the step fails, and either find a new proof path or state explicitly what additional lemma would be needed to close the gap. A confident-sounding patch over a failed step is worse than an honest \"this step requires further work.\"\n\n## Core principles\n\n### No gaps between steps\n\nEvery transition from one equation to the next must be justified. If you use the quotient rule, say so. If you substitute a definition, point to which definition. If a sign is negative, explain why. The reader should never need to work out an intermediate step on their own.\n\n**Bad:**\n$$\\frac{d}{d\\rho}\\frac{n_G}{n_B} = \\frac{2q-1}{n_B^2} > 0.$$\n\n**Good:**\nWe compute $\\frac{d}{d\\rho}(n_G/n_B)$ using the quotient rule. First, the derivatives:\n$$\\frac{dn_G}{d\\rho} = q, \\qquad \\frac{dn_B}{d\\rho} = 1-q.$$\nApplying the quotient rule:\n$$\\frac{d}{d\\rho}\\frac{n_G}{n_B} = \\frac{q \\cdot n_B - (1-q) \\cdot n_G}{n_B^2}.$$\nExpanding the numerator:\n$$q[\\rho + (1-\\rho)q] - (1-q)[\\rho + (1-\\rho)(1-q)] = \\rho(2q-1) + (1-\\rho)(2q-1) = 2q-1.$$\nSince $q > 1/2$, this is positive.\n\n### State what you want to show before showing it\n\nOpen each step with a sentence explaining the goal: \"We want to show that $t$ decreases with $\\rho$.\" Then deliver the proof. The reader should know where you are headed before wading into algebra.\n\n### Sign every term\n\nWhen a derivative or expression appears, immediately state its sign and why. Do not leave sign determination as an exercise. If a quantity is negative because it is a log of a number less than 1, say so explicitly.\n\n### Bridge definitions to usage\n\nWhen you define a quantity (like a threshold $t$) and then use it in a derivative, explain the connection. Do not jump from \"$Y \\geq$ [some expression]\" to \"$t(K,\\rho) =$ [formula]\" without a sentence like: \"Define $t(K,\\rho)$ as the minimum number of yes votes required for allocation, i.e., the smallest integer $Y$ satisfying this inequality.\"\n\n### Show intermediate algebra\n\nExpand products, collect terms, cancel factors. Do not skip from a quotient rule setup to a simplified final form. Show at least one intermediate line where terms are expanded but not yet simplified.\n\n### Explain why results are intuitive\n\nAfter a formal derivation, add one sentence of economic or mathematical intuition. \"The threshold drops because no votes carry less information, so fewer yes votes suffice to outweigh them.\" This helps the reader connect the math to the model.\n\n### Mechanistic verifiability\n\nEvery step should be verifiable as if by a formal proof assistant (Lean, Coq, Isabelle). Before writing each line, ask: \"Could this step, in principle, be encoded in formal logic without adding new assumptions?\" If not, it is too vague and needs to be broken down further.\n\nConcretely:\n- \"By continuity, the limit can be exchanged\" → state which theorem justifies the exchange (dominated convergence, uniform convergence on compact sets, etc.)\n- \"The matrix is positive definite\" → prove it: show all eigenvalues are positive, or verify the definition directly.\n- \"This sum converges absolutely\" → bound the terms and invoke a comparison test or ratio test explicitly.\n- \"The two expressions are equal by symmetry\" → state which symmetry, and verify it is exact, not approximate.\n\nThis principle is the main safeguard against producing a confident-sounding but subtly flawed argument. Natural language makes it easy to hallucinate plausible but incorrect intermediate steps — demanding mechanistic verifiability at each line blocks this failure mode.\n\n### Self-contained proofs\n\nThe proof must be self-contained. Only cite well-known theorems — as a rule of thumb, a theorem must be famous enough to have a Wikipedia page or be taught in standard undergraduate courses. Do not invoke obscure or non-existent results. If you need a non-standard lemma, prove it inline.\n\n### Prove the general case, not examples\n\nNever prove a claim only for specific cases or small examples and then assert it holds in general. If you verify a property for $n=1,2,3$, that is evidence, not a proof. You must provide an argument that covers the full generality of the claim. If the general proof is beyond reach, state this explicitly: \"We have verified this for $n \\leq 5$; the general case remains open.\"\n\n## Proof structure\n\n### 1. Setup section\n\n- Define all notation up front\n- State the model primitives (distributions, parameters, decision rules)\n- Write the key quantities as explicit functions of the parameters\n\n### 2. Numbered steps\n\nEach step should:\n- **Open** with a plain-language statement of what will be shown\n- **Derive** the result with full intermediate algebra\n- **Sign** every derivative and explain the sign\n- **Close** with boundary values or limiting cases where helpful\n\n### 3. Connecting steps\n\nWhen one step feeds into the next, say so explicitly: \"Substituting the result from Step 1 into the expression for $c_K$...\" Do not assume the reader tracks which results carry forward.\n\n### 4. Edge cases and case analysis\n\nEnumerate all cases explicitly. If you claim a result holds \"for all $x > 0$\", check boundary behavior at $x = 0$ and $x \\to \\infty$. Do not silently assume non-degeneracy. If the proof requires case splits (e.g., $n$ even vs odd, or an angle acute vs obtuse), handle every case — do not prove one case and assert \"the other case is similar\" unless the symmetry is genuinely obvious and you state the symmetry.\n\n### 5. QED\n\nEnd with $\\square$ and optionally a one-sentence summary of the full result.\n\n## Common patterns\n\n### Differentiating a ratio $f/g$\n\nAlways use the quotient rule explicitly:\n$$\\frac{d}{dx}\\frac{f}{g} = \\frac{f'g - fg'}{g^2}.$$\nCompute $f'$ and $g'$ separately first, then substitute.\n\n### Signing a log\n\nIf $\\beta = \\log(a/b)$ and you claim $\\beta < 0$, show that $a < b$ first with an explicit inequality.\n\n### Chain rule through a CDF\n\nWhen differentiating $P(Y \\geq t(\\rho))$ where both $t$ and the distribution parameter depend on $\\rho$:\n$$\\frac{d}{d\\rho}P(Y \\geq t) = \\frac{\\partial P}{\\partial t}\\cdot\\frac{dt}{d\\rho} + \\frac{\\partial P}{\\partial p}\\cdot\\frac{dp}{d\\rho}.$$\nSign each term separately, then discuss which dominates.\n\n### Discrete vs continuous\n\nWhen a threshold must be an integer but you differentiate as if it were continuous, flag this: \"Treating $t$ as continuous for tractability. In practice, $t$ is an integer, so small changes in $\\rho$ can cause discrete jumps in $t$.\"\n\n### Inequality manipulation\n\nWhen manipulating inequalities, explicitly justify every direction change. Common errors include: reversing inequality signs when multiplying by ","tagline":"Write clear, detailed mathematical proofs for academic papers. 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