背理法【超わかる！高校数学Ⅰ・A】～授業～論理と集合＃２１

The key to proof by contradiction! Proof by contradiction is a proof technique that negates the conclusion and leads to a contradiction, thereby showing that the assumption is false, i.e., the conclusion is correct! When something is difficult to prove directly, try questioning the use of proof by contradiction! [Previous Video] Proof that the truth of the proposition and the contrapositive are identical - Proof    • 命題と対偶の真偽が一致することの証明【超わかる！高校数学Ⅰ・A】～証明～論理と集合＃２０   [Next Video] [Kyushu University (Similar Questions)] Proof by contradiction - Exercise    • 【九州大】背理法【超わかる！高校数学Ⅰ・A】～演習～論理と集合＃２２   "For those who want to learn logic and sets from the beginning and master them," please click here☆    • 集合と命題【高校数学Ⅰ】   "Subscribe" to our channel here! ☆    / @chowakaru   Follow us on Twitter! ☆   / honda_math   *We may feature wonderful comments on our videos and channel at the end of videos! We're seeing a steady stream of students achieving "top marks in their grade" and "national deviation scores above 70"! "Super Easy to Understand! High School Math" is a YouTube channel that provides incredibly thorough and concise explanations of only the most important questions essential for getting into top universities! Students taking entrance exams for the University of Tokyo, Kyoto University, former imperial universities, Waseda University, Keio University, and medical schools are also watching! Many subscribers have expressed their excitement, saying, "My grades improved!" This is a work that fully showcases the creativity and passion for mathematics of a professional exam preparation instructor who taught over 500 students one-on-one at a major prep school. You'll be hooked! Get started now! Official website: http://kouki-honda.jp/