Is an erroneous belief that is fixed and firmly held despite clear contradictory evidence. this word comes from the latin verb ludere, which means "to play".

Delusion is defined as an erroneous belief that if fixed and firmly held despite clear contradictory evidence

is a belief that is clearly false and that indicates an abnormality in the affected person's content of thought. The false belief is not accounted for by the person's cultural or religious background or his or her level of intelligence.

vertical merger is the term used for the joining of two or more firms involved in different stages of producing the same good or services.

explanation:

the correct answer is the following is a list of inventions made in the medieval islamic world, especially during the "islamic golden age" (8th to 13th centuries),[1][2] as well as the late medieval period, especially in the emirate of granada and the ottoman empire.

science and technology in the islamic world adopted and preserved knowledge and technologies from contemporary and earlier civilizations, including persia, india, china, and greece-roman antiquity, while making a number of improvements and innovations.