Krystian Karczyński- 2 March 2026
Domain of a Function with e – Why “All Real Numbers” Is Often Wrong
Domain of a Function with e – Why “All Real Numbers” Is Often Wrong You see e(something)e^{(\text{something})} in...
- Krystian Karczyński
- 24 February 2026
Proof That √2 Is Not a Rational Number
Can every number be written as a fraction? For a long time, mathematics relied only on natural numbers,...
- Krystian Karczyński
- 10 February 2026
How to Understand What Multivariable Functions Are
Understanding from the very basics what a function of two or three variables actually is is extremely important...
- Joanna Grochowska-Angielczyk
- 6 February 2026
Regression and the Least Squares Method: Where Do Parameter Estimates Come From?
Econometrics – Lecture 6 Topic: Regression analysis. Estimation of model parametersusing the Least Squares Method. In this lecture,...
- Joanna Grochowska-Angielczyk
- 6 February 2026
How Strongly Are Variables Related? The Pearson Linear Correlation Coefficient
Econometrics Lecture 5 Topic: Pearson’s Linear Correlation Coefficient and Its Significance The main goal of econometrics is to...