This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
KaisekiGairon.svg en is defined area domain on xy plane varphi and varphi are continuous on the closed domain including and varphi varphi tesigana PDJapan
Page 2023 Free-images.com. All images are Public Domain