Eruvin 50
The principle of kol sheeino bzeh achar zeh - vlo b'vat achat - application to the laws of ma'aser and the meaning behind this halacha and concept

The principle of kol sheeino bzeh achar zeh - vlo b'vat achat - application to the laws of ma'aser and the meaning behind this halacha and concept
The halacha of two alleyways and the courtyard in the middle- principle of kofin al midat sedom and when it is applied
The halachic concept, source and depth behind the principle of a person's 4 amot of space- application to mechitza in shul
The machloket between Rabbi Yehuda and Rabbi Yosi regarding the parameters around which a person may leave Eretz Yisrael to study Torah- what happens when there is a clash with honoring one's parents and Torah study?
The principle of Rabbi Akiva being the authority in a machloket and Rabbi Yehuda's opinion being regarded over Rabbi Meir- application to the tefilla of Avinu Malkeinu
Defending a city from a siege through defense or preemptive strikes
Permission to leave techum Shabbat to save a life, application to hatzalah returning from an emergency call on Shabbat
Is there a vertical Shabbat techum- boundary above 10 tefachim? Applications to riding on a wagon or bicycle on Shabbat
The parameters and background to the institution of techum Shabbat, halachic status of food that went beyond the techum and was then brought back in intentionally
Halacha of fast days that fall on Friday- do we break the fast before Shabbat begins? private vs. Public fast days, the story of Rabbi Akiva and application to breaking fasts when one is ill, choice between tzom gedaliah and Yom Kippur fasting
The tefillot of Rosh Hashana- do we add for Rosh chodesh? What about when Rosh Hashana falls on Shabbat? Is there Hallel or mention of joy? Do we make a shehecheyanu?
The nature of Rosh Hashana as a 2 day holiday that is really one long 48-hour period of holiday, applications to the laws of mourning and contrast to yomtov sheini of other holidays
When Shabbat and Yom Tov fall consecutively, application to eruv, laws of Yom Tov, the concept of hachana as a prohibition and as a requirement for preparing before Shabbat and Yom Tov
The principle of breira, its application to choosing which eruv is effective after the fact and questions about the use of parchment set aside for a sefer Torah to be used for non-holy purposes
The parameters and explanation behind the principle of techum Shabbat - is it Rabbinic or Biblical?
When the eruv food is destroyed or lost but it is unclear whether it was destroyed before or after Shabbat began, application to a doubt in the laws of beracha acharona
The effectiveness of an eiruv inside of a house that is locked and nobody has a key- may one break the lock to get in? Can one ask a gentile to do so?
Are tree branches considered to be private or public domain? The prohibition of "moshit"- passing between 2 people and the prohibition of the Levites to see the holy vessels of the mishkan
The concept and parameters of allowing one to violate a minor sin in order to prevent someone from violating a major sin, application to cheyt ha'eygel
The principle of mitzvot lav lehanot nitnu- does this apply only Torah mitzvot or even Rabbinic mitzvot? What is the nature of the mitzvah to comfort mourners and to bring joy to a chattan and kallah?
The concept of an Ohel zaruk- is it more like a car? A plane? How does it work for kohanim to fly on planes that fly over cemeteries?
The story of Rabbi Chanina and the onion that caused him to fall deathly ill, the concept and importance of praying for others
The bracha on and usability of keshut- dodder for eruv chatzerot, story of Rabbi Zeira and discussion around performing mitzvot with the reward as a motivation
The kinds of foods that may be used for eruv chatzerot, techum, and shituf mevo'ot, application to laws of berachot and water on Yom Kippur
The institution of eiruv chatzerot - what was included in this institution and how does it work
The principle of pi tikra yored v'sotem- the edge of a roof can conceptually descend and form a wall, analysis of when this is applied and discussion of modern day overpass bridges being used as part of city eruvin
What kind of gardens or parks are considered part of the eruv and which ones cause the eruv to be called into question when they are larger than 2 sa'atayim?
The parameters of an area not enclosed for dwelling (karpef), the source for this halacha in the mishkan, calculating the area of 2 sa'atayim (in ft) according to Rav Chaim Naeh, Rav Moshe Feinstein, and the Chazon ish
The principle of atu rabim u'mevatlei mechitza, at what point an area is too large to be able to turn it into a private domain and what kinds of mechitzot may be used for these larger areas
The institutions of King Shlomo: netilat yadayim and eruvei chatzerot, why this was accomplished during the days of shlomo and why it was considered such an incredible accomplishment