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Single input operators

• NOT: input is false

Two input operators

• A → B: true A forces true B, but false A allows either true or false B

Multiple input operators

• AND: all inputs are true
• NAND: at least one input is false
• OR: at least one input is true
• NOR: all inputs are false
• XOR: an odd number of inputs are true
• XNOR/↔: an even number of inputs are true