Three logical symbols

In order to gain logical thinking skills, you just need to make full use of the following three symbols: “=“, “⇔” and “→”.

“=“ stands for equality.
For example, rain and weather are equal: “rain = weather”. More specifically, compared with rain, weather is abstract. In other words, in comparison with weather, rain is concrete.
“⇔” means opposition.
For instance, “rainy” and “sunny” are opposite: “rainy ⇔ sunny”.
“→” signifies cause and effect.
As an example, you will hold an umbrella due to raining: “raining → holding an umbrella”.

Just using these logical symbols while studying and working, your brain will become logical!