The time and space hierarchy theorems form the basis for most separation results of complexity classes. For instance, the time hierarchy theorem tells us that P is strictly contained in EXPTIME, and the space hierarchy theorem tells us that L is strictly contained in PSPACE.
समय पदानुक्रम प्रमेय के अनुसार पी को बाधित करने के लिए क्या जिम्मेदार है? 
एक्सपेम 