L={a^{n}b^{n} } - {a^{13}b^{13}}

which is DCFL - Regular and that results DCFL...

what do i need to explain ?

hope you know a^{n}b^{n }is DCFL...it's most basic DCFL...everything is determined so DCFL..

a^{13}b^{13 }: finite so regular...

L-regular is always of type L...closure property..