Unusual Math Formulas on Blackboard: Understanding Pi and Lambda

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motleycat
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Someone has spray-painted (no idea why) these formulas on the blackboard. I assume they are from the math class that is held before our physics class. I'm guessing it to be calculus or mathematical logic but I don't know.
What I'm reading is that pi equals lambda and therefore f equals 1. Does it make any sense? If yes, what does it actually mean?
 

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DaleSpam said:
It is graffiti, not a textbook.
So you're saying they're nonsense?