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SUMMARY
Rebbi Tarfon holds that Keren in Reshus ha'Nizak pays Nezek Shalem, while the Chachamim hold that it pays Chatzi Nezek.
Rebbi Tarfon holds that the Din of Dayo does not apply if the Kal va'Chomer would no lo longer be made.
Shichvas Zera is Mitamei with Maga (touching).
Rebbi Elazar says that the Shichvas Zera of a Zav is Mitamei with Maga but not with Masa.
Rebbi Yehoshua says that the Shichvas Zera of a Zav is also Mitamei with Masa because it is impossible that there isn't a little bit of Zivah mixed in.
The Zovo of a Zav, his spit, Shichvas Zera, urine and the blood of a Nidah is Mitamei with Maga and with Masa. (1)
Small earthenware jugs do not susceptible to Tum'as Zav but they are susceptible to Tum'as Mes and Sheretz. (2)
A reed mat is susceptible to all types Tum'ah. (3)
A Sheretz the size of a lentil is Mitamei while a Mes is only Mitamei if it is the size of an olive.
It is a Machlokes if a Din that is being learned out takes all of the Dinim of what it is learning it out from.
All Tum'os from a Mes are not Tamei for less than seven days.
Shen and Regel are Patur in Reshus ha'Rabim.
A BIT MORE
1. This Keri of a Zav is learned out with a Kal va'Chomer from spit that it is Mitamei with Maga and Masa.
2. Earthenware utensils only become Tamei from the inside and small jugs that are too small for the Zav to put his finger inside cannot become Tamei with Maga and since they do not become Tamei Maga they also do not become Tamei Heset.
3. Even though it is not a utensil it is suitable for Mishkav and it is susceptible to Tum'as Midras of a Zav and all other Tum'as are learned out from Zav.
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BRIEF INSIGHT
KAL VA'CHOMER
Small earthenware jugs are not susceptible to Tum'ah from a Zav because earthenware utensils only becomes Tamei from the inside and small jugs that are too small for the Zav to put his finger inside cannot become Tamei with Maga of a Zav. Tosfos asks even though it is too small for a Zav to put his finger inside however it is not too small for the Zav top put a hair inside and the hair of a Zav is Mitamei. Tosfos answers that since it is too small for his finger it is not susceptible to Tum'ah from his hair either become the Tum'ah of the hair is learned out from the Tum'ah of the flesh and if it is not Tamei from the flesh it is not Tamei from the hair as well.
QUICK HALACHAH
A ZAV
The spit of a Zav, Shichvas Zera and urine each one is an Av ha'Tum'ah Min ha'Torah and even a small amount is Mitamei with Maga and Masa. The urine and Shichvas Zera inevitable contains the Zovo of a Zav. (Rambam Hilchos Mitamei Mishkav u'Moshav 1:14)
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