It is hard to decide what makes Ciro Santilli more sad: the usage of Greek letters, the invention of new symbols, or the fifty million alternative font styles used.
Only Chinese characters could be worse than that!
These are not in the Greek alphabet:
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Mathematical notation refers to a standardized set of symbols and conventions used to represent mathematical concepts, operations, relationships, and structures. The purpose of such notation is to allow mathematicians and students to communicate ideas clearly and concisely. Here are some key aspects of mathematical notation: 1. **Symbols**: Mathematical notation includes a variety of symbols that represent numbers, operations, relations, functions, and other elements.