# some pages on Wikipedia are named differently than on PM, so links need to be changed
# (it does not matter how much space is there below on both sides of --)
# PM link -- Wikipedia link
image -- image (mathematics)
image2 -- function (mathematics)
union -- union (set theory)
intersection -- intersection (set theory)
mathbbr -- real number
mathbbq -- rational number
mathbbz -- integer
inclusion2 -- subset
ring -- ring (mathematics)
real -- real number
positive -- negative and non-negative numbers
negative -- negative and non-negative numbers
compact -- compact set
boundary -- boundary (topology)
range -- range (mathematics)
continuous -- continuous function
domain -- domain (mathematics)
