@HenriMenke It produces some slight curve in the top of the symbol, but that line should be a straight line as shown in the image...any how, thanks...
– MadyYuviNov 30 '18 at 09:31
you don't normally want to choose a font separately for each symbol (unless you are writing a ransom note) just choose one font family for all your mathematics
– David CarlisleNov 30 '18 at 09:59
$\lambda$? (code, screenshot) – Henri Menke Nov 30 '18 at 09:30