adult student
analyzing
blackboard
board room
calculus
chalk
classroom
college student
contemporary
education
education occupation
expertise
explaining
formula
holding
human finger
human hand
indoors
intelligence
lifestyles
mathematical proof
mathematical symbol
mathematics
mature student
people
practicing
professor
reading
selective focus
sketching
skill
solution
study
studying
teacher
teaching
text
unrecognizable person
western script
wisdom
writing
youth culture