סֻכָּה שֶׁהִיא גְבוֹהָה לְמַעְלָה מֵעֶשְׂרִים אַמָּה, פְּסוּלָה. רַבִּי יְהוּדָה מַכְשִׁיר.
A sukkah which is more than twenty cubits high is not valid. Rabbi Judah validates it.
The process of "Gemara" proceeded in what were then the two major centers of Jewish scholarship, Galilee and Babylonia. Correspondingly, two bodies of analysis developed, and two works of Talmud were created. The older compilation is called the Jerusalem Talmud or the Talmud Yerushalmi. It was compiled in the 4th century in Galilee. The Babylonian Talmud was compiled about the year 500, although it continued to be edited later. The word "Talmud", when used without qualification, usually refers to the Babylonian Talmud.
The Babylonian Talmud (Talmud Bavli) consists of documents compiled over the period of late antiquity (3rd to 6th centuries).During this time the most important of the Jewish centres in Mesopotamia, a region called "Babylonia" in Jewish sources and later known as Iraq, were Nehardea, Nisibis (modern Nusaybin), Mahoza (al-Mada'in, just to the south of what is now Baghdad), Pumbedita (near present-day al Anbar Governorate), and the Sura Academy, probably located about 60 km south of Baghdad.
Shlomo Yitzchaki, 22 February 1040 – 13 July 1105), today generally known by the acronym Rashi (Hebrew: רש״י, RAbbi SHlomo Itzhaki), was a medieval French rabbi and author of a comprehensive commentary on the Talmud and commentary on the Tanakh. Acclaimed for his ability to present the basic meaning of the text in a concise and lucid fashion, Rashi appeals to both learned scholars and beginner students, and his works remain a centerpiece of contemporary Jewish study. His commentary on the Talmud, which covers nearly all of the Babylonian Talmud (a total of 30 out of 39 tractates, due to his death), has been included in every edition of the Talmud since its first printing by Daniel Bomberg in the 1520s. His commentary on Tanakh—especially on the Chumash ("Five Books of Moses")— serves as the basis for more than 300 "supercommentaries" which analyze Rashi's choice of language and citations, penned by some of the greatest names in rabbinic literature.
The Tosafot or Tosafos are medieval commentaries on the Talmud. They take the form of critical and explanatory glosses, printed, in almost all Talmud editions, on the outer margin and opposite Rashi's notes.
Up to and including Rashi, the Talmudic commentators occupied themselves only with the plain meaning ("peshaṭ") of the text Tosfot is more interested in how this text would "fit" with another passage in a different part of the Talmud.
1] which Tanna is the author of the opinion expressed in the Mishna?
2] surly this is obvious?
3] how do you that this is the law?
4] when is this matter so?
5] come and hear.