לעיתים הפונקציה נקראת גם "לוגריתם המכפלה" (באנגלית product logarithm) כיוון שאם הפונקציה ההופכית של נקראת לוגריתם, אז הגיוני לקרוא לפונקציה ההופכית של המכפלה בשם "לוגריתם המכפלה"
את המשוואה השנייה ניתן למצוא על ידי שימוש בהחלפה , ואז ניתן גם להחליף את:
ואז ניתן להראות כי:
המשוואה השלישית נובעת מהמשוואה השנייה על ידי ההחלפה , ובנוסף גם המשוואה הראשונה נובעת מהשלישית על ידי ההחלפה .
אינטגרלים לא מסוימים
הוכחה ראשונה
אם נציב את המשתנה נקבל:
הוכחה שנייה
הוכחה
הוכחה
אם נציב את המשתנה נקבל:
ערכים מיוחדים
עבור כל מספר אלגברי השונה מ-0, מתקיים כי הוא מספר טרנסצנדנטי. אם הוא 0, אז חייב להיות גם הוא 0, ואם הוא מספר לא אלגברי שונה מאפס, אז לפי משפט לינדמן-ויירשטראס, חייב להיות מספר טרנסצנדנטי, ולכן חייב להיות גם הוא מספר טרנסצנדנטי.
^Dubinov, A. E.; Dubinova, I. D.; Saǐkov, S. K., The Lambert W Function and Its Applications to Mathematical Problems of Physics, 2006, עמ' 53. (ברוסית)
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