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9 ta ish
Ish: A problem with the Frankl and Bitsadze-Samarskii condition on the line of degeneracy and on parallel characteristics for a mixed-type equation
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Ishlab chiquvchilar uchun
9 ta ish
Ish: A problem with the Frankl and Bitsadze-Samarskii condition on the line of degeneracy and on parallel characteristics for a mixed-type equation