Conclusion of אתי אוירא מהאי גיסא ואוירא מהאי גיסא ומבטלה
Question:
In the case of עור העסלא (on bottom of דף י עמוד ב) if the total width of the seat is one tefach it is an אהל לטומאה. We discussed earlier a concept of אתי אוירא מהאי גיסא ואוירא מהאי גיסא ומבטלה. Why when the space between the two solid planks is equal or larger than the solid part don’t we apply the rule of אתי אוירא? The solid part of the seat should be negated and no longer considered an אהל לטומאה ?
Learn “תוס’ “ואצבעיים who explains some principles of when we do not apply the concept of אתי אוירא מהאי גיסא ואוירא מהאי גיסא ומבטלה
Quickly review the משנה דף ב
Learn the גמרא דף י עמוד ב “אם יש לו צורת הפתח (two dots – four lines form bottom of the Amud) until “מתני לה” (eight lines from top of the Amud)
Sugya: אמלתרא
Major Question:
The gemara inquires whether an אמלתרא would help a Korah be a valid Tikun for a Mavui whose opening is wider than 10 Amos. The Gemara (3a) said the benefit of an אמלתרא is that it attracts attention and makes the Korah noticable therefore a Korah with an אמלתרא can be placed higher than 20 Amos. An opening wider than 10 Amos is considered a Pirtzah. How could an אמלתרא help for an opening wider than 10 Amos as the issue is entirely different?
See ב”ח ס’ שס”ג סעיף כו
And שפת אמת דף ג. לא תהני
How do we conclude l’halacha regarding whether an אמלתרא can help for an opening wider than 10 Amos?
Sugya: צורת הפתח
Learn ‘תוס’ דף יט “איפכא