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יש ספרי מתמטיקה שמלאים במספרים. לספר הזה יש כלל אחד, הפוך לחלוטין: לדבר על מתמטיקה בלי להשתמש אפילו בספרה אחת.

זו נקודת הפתיחה, ומתוכה נברא עולם שלם שבו אינסוף מתנהג כמו יצור חי, צורות נמתחות כמו גומי, והוכחות סבוכות הן סיפורים מרתקים. אין כאן נוסחאות, רק מחשבה סקרנית, אינטואיציה והומור.

זהו מסע חוצה־ממדים לתוך השפה הכי מדויקת בעולם, שמחזיר לה את הפליאה והיופי שאולי אבדו לה בשיעורים בבית הספר. את ההרפתקה הזאת מוביל מיילו בקמן, מי שזכה לכינוי \"ילד הפלא של המתמטיקה העולמית.\" בקמן חושב כמו אמן ומאמין שאפשר להבין כל דבר – צמחים, אהבה, מוזיקה, הכול – במונחים מתמטיים. הוא שואל שאלות שלא תמיד מובילות לתשובות, ומוכיח שאפשר להבין את קסם המתמטיקה גם בלי לדעת לפתור משוואה אחת.

מתמטיקה ללא מספרים עושה לתחום הידע המסעיר הזה את מה ש\"גדל, אשר, באך\" עשה לו לפני חמישים שנה – הוא מזכיר לנו שמאחורי כל תבנית ונוסחה יש מחשבה פילוסופית, מאחורי כל חוק ניצבת שאלה פתוחה, ומאחורי כל מספר, מסתתרים אינסוף סיפורים.

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