It's in a phase diagram topic. It's about Cu-Sn phase diagram.
I have this schematic diagram that describe the following scenarios and identifies the regions and the phases at 40%Sn alloy from 800°C "L → L and γ → L, γ, and ε → L and ε" as an example but it's confusing to follow. It's just an example and it doesn't follow the Cu-Sn phase diagram anyway.
But does the first one mean L→ L+ γ ?
And L , y is different phases ... That manage to fall both at 40%Sn alloy from 800°C?
Also am i correct to assume that the final one means ε → L + ε?
Here's the Pdf file for more information: https://uh.edu/~hfang2/MECE3345/Lectures/Chapter9.pdf
This image is from pdf file: http://www.engr.mun.ca/~asharan/courses/5911_LECTURES/ch09.ppt