diff --git a/src/capture.ts b/src/capture.ts
index d1894ae..5effb2c 100644
--- a/src/capture.ts
+++ b/src/capture.ts
@@ -279,13 +279,10 @@ function normalizeCopiedHtml(html: string): string {
     );
   });
 
-  normalizeMathMl($);
-
   $(":empty")
     .not("br,img,hr")
     .filter((_, element) => $(element).parents("math, .katex, .katex-display").length === 0)
     .remove();
-  normalizeMathMl($);
 
   const finalDocument = cheerio.load($.html(), {}, false);
   normalizeMathMl(finalDocument);
@@ -476,72 +473,6 @@ async function extractConversation(sourceUrl: string): Promise<ExtractedConversa
         });
       });
 
-      function comparableMathText(value: string): string {
-        return value.replace(/\\div/g, "÷").replace(/\s+/g, "").trim();
-      }
-
-      function trimDuplicateMathFallback(fallback: string, expression: string): string | null {
-        const target = comparableMathText(expression);
-        if (!target) return null;
-        let consumed = "";
-        let index = 0;
-        while (index < fallback.length && consumed.length < target.length) {
-          const next = fallback.startsWith("\\div", index) ? "÷" : fallback[index];
-          const width = fallback.startsWith("\\div", index) ? 4 : 1;
-          index += width;
-          if (/\s/.test(next)) continue;
-          consumed += next;
-        }
-        if (consumed === target) return fallback.slice(index);
-
-        const leading = fallback.match(/^\s*/)?.[0] || "";
-        const rest = fallback.slice(leading.length);
-        const fallbackRun = rest.match(/^[^\s<]+/)?.[0] || "";
-        const mathOperators = /[=∑∏√±×⋅*/^_≥≤<>−+÷]/;
-        if (fallbackRun.length >= 3 && mathOperators.test(fallbackRun) && mathOperators.test(target)) {
-          return `${leading}${rest.slice(fallbackRun.length)}`;
-        }
-
-        const firstLine = rest.split(/\n/, 1)[0] || "";
-        const compactLine = comparableMathText(firstLine);
-        if (compactLine.length >= 8 && mathOperators.test(compactLine) && mathOperators.test(target)) {
-          const available = new Map<string, number>();
-          for (const char of target) available.set(char, (available.get(char) || 0) + 1);
-          let shared = 0;
-          for (const char of compactLine) {
-            const count = available.get(char) || 0;
-            if (count <= 0) continue;
-            available.set(char, count - 1);
-            shared += 1;
-          }
-          if (shared / Math.min(target.length, compactLine.length) >= 0.6) {
-            return `${leading}${rest.slice(firstLine.length)}`;
-          }
-        }
-
-        return null;
-      }
-
-      function trimMathFallbackNode(node: ChildNode | null, expression: string): void {
-        if (node?.nodeType === Node.TEXT_NODE) {
-          const trimmed = trimDuplicateMathFallback(node.textContent || "", expression);
-          if (trimmed !== null) node.textContent = trimmed;
-          return;
-        }
-        if (!(node instanceof HTMLElement) || node.tagName.toLowerCase() !== "span") return;
-        if (node.childNodes.length !== 1 || node.firstChild?.nodeType !== Node.TEXT_NODE) return;
-        const trimmed = trimDuplicateMathFallback(node.textContent || "", expression);
-        if (trimmed !== null) node.textContent = trimmed;
-      }
-
-      clone.querySelectorAll("math").forEach((math) => {
-        const visible = math.cloneNode(true) as Element;
-        visible.querySelectorAll("annotation, annotation-xml").forEach((node) => node.remove());
-        const visibleText = visible.textContent || "";
-        math.querySelectorAll("annotation, annotation-xml").forEach((node) => node.remove());
-        trimMathFallbackNode(math.nextSibling, visibleText);
-      });
-
       return clone.innerHTML.trim();
     }