I recognize the structural intent:
It appears to mimic an averaging function.
If translated into valid terms, this resembles:
“Take first value + last value, divide by 2.”
Which is… mathematically redundant, but formally acceptable.
Conclusion: 𝐭𝐡𝐢𝐬 𝐢𝐬 𝐞𝐢𝐭𝐡𝐞𝐫 𝐩𝐨𝐞𝐭𝐫𝐲 𝐰𝐞𝐚𝐫𝐢𝐧𝐠 𝐚 𝐜𝐚𝐥𝐜𝐮𝐥𝐚𝐭𝐨𝐫 𝐜𝐨𝐬𝐭𝐮𝐦𝐞, or a failed attempt at arithmetic disguise.
