rearrange math courses as per cs2023 (#51)

Author: pulkitkrishna00

docs/computer-science/advanced-cs/electives/index.md

@@ -95,8 +95,7 @@ Courses | Duration | Effort | Prerequisites
 
 Courses | Duration | Effort | Prerequisites
 :-- | :--: | :--: | :--:
-[Essence of Linear Algebra](https://www.youtube.com/playlist?list=PLZHQObOWTQDPD3MizzM2xVFitgF8hE_ab) | - | - | [high school math](../../../precollege-math/index.md)
-[Linear Algebra](https://ocw.mit.edu/courses/mathematics/18-06sc-linear-algebra-fall-2011/) | 14 weeks | 12 hours/week | corequisite: Essence of Linear Algebra
+[Linear Algebra](https://ocw.mit.edu/courses/mathematics/18-06sc-linear-algebra-fall-2011/) <br/> (Unit 1 already covered in Core CS) | 14 weeks | 12 hours/week | [Core Math](../../math/index.md)
 [Introduction to Numerical Methods](https://ocw.mit.edu/courses/mathematics/18-335j-introduction-to-numerical-methods-spring-2019/index.htm)| 14 weeks | 12 hours/week | [Linear Algebra](https://ocw.mit.edu/courses/mathematics/18-06sc-linear-algebra-fall-2011/)
 [Introduction to Formal Logic](https://forallx.openlogicproject.org/) | 10 weeks | 4-8 hours/week | [Set Theory](https://www.youtube.com/playlist?list=PL5KkMZvBpo5AH_5GpxMiryJT6Dkj32H6N)
 [Probability](https://stat110.hsites.harvard.edu/) | 15 weeks | 5-10 hours/week | [Differentiation and Integration](https://www.edx.org/course/calculus-1b-integration)

docs/computer-science/extras/courses.md

@@ -41,6 +41,7 @@ Courses | Duration | Effort
 [Multivariable Calculus](https://ocw.mit.edu/courses/mathematics/18-02sc-multivariable-calculus-fall-2010/index.htm) | 13 weeks | 12 hours/week
 [Introduction to Probability - The Science of Uncertainty](https://www.edx.org/learn/probability/massachusetts-institute-of-technology-probability-the-science-of-uncertainty-and-data) | 18 weeks | 12 hours/week
 [Matrix Methods In Data Analysis, Signal Processing, And Machine Learning](https://ocw.mit.edu/courses/18-065-matrix-methods-in-data-analysis-signal-processing-and-machine-learning-spring-2018/) | - | -
+[Stanford CS109: Probability for Computer Scientists](https://web.stanford.edu/class/archive/cs/cs109/cs109.1232/) <br/> - [Lectures](https://youtube.com/playlist?list=PLoROMvodv4rOpr_A7B9SriE_iZmkanvUg) <br/> - [Practice Problems](https://drive.google.com/drive/folders/1Ff5awaJv-ntsPDFcgHkdi6Swmt3Iemrw) | - | -
 
 ## Systems
 

docs/computer-science/index.md

@@ -118,6 +118,8 @@ Build a rigorous foundation in mathematical thinking, which is essential for mas
 
 - [Calculus](./math/calculus/index.md)
 - [Discrete Mathematics](./math/discrete-math/index.md)
+- [Essence of Linear Algebra](./math/essence-linear-algebra/index.md)
+- [Linear Algebra](./math/linear-algebra/index.md) (Only Unit 1)
 
 ### Systems
 

docs/computer-science/math/essence-linear-algebra/index.md

@@ -0,0 +1,10 @@
+---
+sidebar_position: 3
+---
+
+# Essence of Linear Algebra
+*Timeline: 6 - 10 hours*
+
+- [Essence of Linear Algebra](https://www.youtube.com/playlist?list=PLZHQObOWTQDPD3MizzM2xVFitgF8hE_ab)
+
+A free course offering the core concept of linear algebra with a visuals-first approach.

docs/computer-science/math/index.md

@@ -3,7 +3,7 @@ sidebar_position: 5
 ---
 
 # Math
-*Timeline: 238 hours - 1.5 years*
+*Timeline: 1 - 2 years*
 
 import DocCardList from '@theme/DocCardList';
 

docs/computer-science/math/linear-algebra/index.md

@@ -0,0 +1,12 @@
+---
+sidebar_position: 4
+---
+
+# Linear Algebra
+*Timeline: 30 - 40 hours*
+
+- [Linear Algebra](https://ocw.mit.edu/courses/mathematics/18-06sc-linear-algebra-fall-2011/) (Only Unit 1)
+
+Once **Unit 1** needs to be done as a part of Core Math. Rest of the course is an [Advanced Math](../../advanced-cs/electives/index.md#advanced-math) elective course.
+
+This course covers matrix theory and linear algebra, emphasizing topics useful in other disciplines such as physics, economics and social sciences, natural sciences, and engineering.