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For real non-zero values of x, the exponential integral Ei(x) is defined as = =. The Risch algorithm shows that Ei is not an elementary function.The definition above can be used for positive values of x, but the integral has to be understood in terms of the Cauchy principal value due to the singularity of the integrand at zero.
"I before E, except after C" is a mnemonic rule of thumb for English spelling.If one is unsure whether a word is spelled with the digraph ei or ie , the rhyme suggests that the correct order is ie unless the preceding letter is c , in which case it may be ei .
The compact form (which is usually the one meant if no other information is given), which has fundamental group Z/3Z and outer automorphism group Z/2Z. The split form, EI (or E 6(6)), which has maximal compact subgroup Sp(4)/(±1), fundamental group of order 2 and outer automorphism group of order 2.
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Pass the 6-Hour Fundamentals of Engineering (FE) examination to receive an Engineer [6] Intern (EI) enrollment or Engineer-in-Training (EIT) certification. The FE exam was an 8-hour exam prior to 2014. Some states such as Kansas and New York use the designation of IE (Intern Engineer), but is essentially the same as EI or EIT.
The change of original ... The word ei is the negative verb form and has to be inflected for person and the verb itself is usually present, though not always.
There are some differences between Homeric conditionals and those in classical Greek. As well as εἰ (ei) "if", Homer also uses the Aeolic dialect form αἰ (ai). [105] As well as the particle ἄν (án), Homer also uses κέ (ké) or κέν (kén). κέ(ν) (ké(n)) is more frequent than ἄν (án), especially in affirmative sentences. [106]
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