A truth table is a mathematical table used in logic and digital electronics to determine the output of a logic circuit or Boolean expression for every possible combination of input values. It is essential for designing and analyzing digital systems, as it provides a complete functional description of the logic gate or circuit.

A NOR gate is a digital logic gate that implements logical NOR; it behaves according to the truth table of an OR gate followed by an inverter (NOT gate). The output is high only when all inputs are low, which is the inverse of the OR gate output.

The OR operation is a logical disjunction. In Boolean algebra, it is represented by the plus sign (+). The expression X = A + B means that the output X is true if either input A is true, input B is true, or both are true. This is distinct from the AND operation, which is represented by multiplication.

A circle is defined as the locus of points at a constant distance from a center. Because a circle consists of an infinite number of points along its circumference, and a tangent line can be drawn at any single point on that circumference, it follows that there are an infinite number of possible tangent lines that can be drawn to a circle.

A NOT gate, also known as an inverter, performs the logical operation of inversion. It takes a single binary input and produces the opposite output; if the input is high (1), the output is low (0), and if the input is low (0), the output is high (1).

A NOT gate is a fundamental digital logic gate that performs logical negation. It takes a single binary input and produces the opposite output; if the input is 1, the output is 0, and vice versa. Because it inverts the signal, it is commonly referred to as an inverter.

A NOT gate is a digital logic gate that implements logical negation. When a NOT gate is connected to the output of an AND gate, the resulting operation is a NAND (Not-AND) operation. This effectively inverts the output of the AND gate, meaning if the AND gate produces a high signal, the NOT gate converts it to a low signal, and vice versa.

An AND gate is a digital logic circuit that produces a high output (logic 1) only if all its inputs are high (logic 1). If any input is low, the output remains at logic 0.

Logic gates are the fundamental building blocks of digital electronic circuits. They perform basic logical functions such as AND, OR, NOT, NAND, and NOR by processing one or more binary inputs to produce a single binary output. These circuits are essential for implementing Boolean algebra in hardware, enabling the complex decision-making and data processing capabilities found in modern microprocessors and digital systems.

A rectangular waveform, often referred to as a pulse or square wave, is a fundamental digital signal. It transitions abruptly between two discrete voltage levels, representing binary states (high and low or 1 and 0). Unlike analogue signals, which vary continuously over time, digital waveforms are characterized by these distinct, quantized levels, making them the building blocks of modern computing and digital logic systems.