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#9  

Quote:

They used the wrong symbol for the 4077D ic.
I couldn't let it go... and they are not wrong.

So if there is XOR maybe XAND must exists too: https://deepai.org/machine-learning-glossary-and-terms/xand

logic table:

User-inserted image

so it's a XNOR ...  So XOR is true when the inputs are different, a XAND (XNOR) is an "equivalence gate".

If we look careful there is an "e" inside of symbol and the meaning must be "exclusive" or "equivalence"...

User-inserted image

no XAND boolean operator, it's an alias for XNOR.

@Jeremie: Does XAND makes sense when XNOR is the real operator  ?

#10   — Edited

@PTP

Thank you so much! That's really very helpful! You rock!