Thus a subject that had originated from intuitive ideas suggested by real life experiences and studied informally, suddenly became mathematics.

There his interest in art led him to study informally with the painter Leon Berkowitz while still in high school.

He informally studied comparative theology for many years.

Watts continued to study informally with Harris as opportunity allowed.

People who informally study the dog may refer to themselves as 'cynologists' to imply serious study or scientific work.

Later he got opportunity to study informally in Kanpur, India.

While pursuing a medical education, Sandberg informally studied music.

From that time, he worked to help support his family, but continued to study informally on his own (including Greek classics).

Hofmann informally studied with and assisted Reginald Marsh during the early 1950s.

She continues to study informally in various workshops in New York City.