Solution :
Here, we need to perform JOIN operation of the students and registration.
Use NATURAL JOIN operator 
and so no need to specify Join condition.
Also we need to selection operator tp select only those course whose major in "philosophy".
Finally we projection operator π to project only distinct students name who took at least three courses.
![$\pi [\sigma_{\text{student's nam}e} [ \sigma(\text{three courses}) \Join \text{"Philosophy"}]]$](https://tex.z-dn.net/?f=%24%5Cpi%20%5B%5Csigma_%7B%5Ctext%7Bstudent%27s%20nam%7De%7D%20%5B%20%5Csigma%28%5Ctext%7Bthree%20courses%7D%29%20%5CJoin%20%5Ctext%7B%22Philosophy%22%7D%5D%5D%24)
Answer:
This seems to be a Geography question, However, I am answering. The Metamorphic rock textures lies in two larger groups. They are the Non-Foliated and the Foliated.
Explanation:
The answer above explains everything. However, we need to understand the Foliation, and exactly what it is. It is actually developed in the rock through parallel alignment of various minerals(platy), like muscovile, chlorite and biotite, as well as minerals which are needle type such as homblende or feldspars, which are the various tabular minerals.
Yes. They make a lot of money. So eventually after saving your Money, you will make a least 1 million dollars or more.
Answer:
Explanation:
KTurtle is an educational programming environment for turtle graphics. It is released under the open-source GNU General Public License and is part of the KDE Project since KDE3. KTurtle includes an IDE and a programming language which is loosely based on Logo and is intended for teaching programming.
